Linux 5.4 was released on 24 November 2019.

Summary: This release includes the kernel lockdown mode, intended to strengthen the boundary between UID 0 and the kernel; virtio-fs, a high-performance virtio driver which allows a virtualized guest to mount a directory that has been exported on the host; fs-verity, for detecting file tampering, like dm-verity, but works on files rather than block devices; dm-clone, which allows live cloning of dm targets; two new madvise() flags for improved app memory management on Android, support for new Intel/AMD GPUs, support for the exfat file system and removing the experimental status of the EROFS file system; a new haltpoll cpuidle driver and governor that greatly improves performance for virtualized guests wanting to do guest-side polling in the idle loop; and blk-iocost, a I/O cgroup controller that attempts to calculate the cost of I/O more accurately. As always, there are many other new drivers and improvements.

1. Coolest features

1.1. Kernel lockdown mode

This release introduces an optional kernel lockdown feature, intended to strengthen the boundary between UID 0 (root) and the kernel. When enabled, various pieces of kernel functionality are restricted. Applications that rely on low-level access to either hardware or the kernel may cease working as a result - therefore this should not be enabled without appropriate evaluation beforehand. The original purpose of this feature was to honour the anti-tampering protections expected in a secure-boot environment, but it is not tied to that. The majority of mainstream distributions have been carrying variants of this patchset for many years now.

Kernel lockdown is implemented as a Linux Security Module that can be configured in integrity or lockdown mode. If set to integrity, kernel features that allow userland to modify the running kernel are disabled. If set to confidentiality, kernel features that allow userland to extract confidential information from the kernel are also disabled. Configuration can be done at runtime (through securityfs), boot time (via a kernel parameter) or build time (via a kconfig option).

Recommended LWN article: Lockdown as a security module

1.2. virtio-fs, a bridge to share file systems with virtualized guests

This release includes virtio-fs, a FUSE-based virtio driver for guest <-> host file system sharing. It allows a guest to mount a directory that has been exported on the host. Although there are existing technologies that allow this kind of functionality (NFS, virtio-9P), virtio-fs takes advantage of the proximity of VMs to achieve API semantics and performance more like local file systems. This is desirable both for performance and for application compatibility.

For more details, see the documentation, the design documentation and the official web site

1.3. fs-verity, for detecting file modifications

fs-verity is a support layer that filesystems can use to support transparent integrity and authenticity protection of read-only files. It is similar to dm-verity but works on files rather than block devices. Currently, it is supported by the ext4 and f2fs filesystems.

On regular files on filesystems supporting fs-verity, userspace can execute an ioctl that causes the filesystem to build a Merkle tree for the file and persist it to a filesystem-specific location associated with the file. Optionally, it is possible sign files with a key loaded into a keyring. After this, the file is made readonly, and all reads from the file are automatically verified against the file's Merkle tree. Reads of any corrupted data, including mmap reads, will fail. Userspace can efficently retrieve the root hash ("file measurement") with another ioctl, which can be used for a variety of security applications.

For more details, read the documentation

Recommended LWN article: Yet another try for fs-verity

1.4. dm-clone

dm-clone is a device mapper target which produces a one-to-one copy of an existing, read-only source device into a writable destination device: It presents a virtual block device which makes all data appear immediately, and redirects reads and writes accordingly. The main use case of dm-clone is to clone a potentially remote, high-latency, read-only, archival-type block device into a writable, fast, primary-type device for fast, low-latency I/O. The cloned device is visible/mountable immediately and the copy of the source device to the destination device happens in the background, in parallel with user I/O.

For more details, see the documentation

1.5. Support for new AMD/Intel graphics

This release adds support in the amdgpu driver for four new amdgpu products: Navi 12/14, Arcturus and Renoir APU support.

It also includes the first pieces for supporting the future Intel Tiger Lake GPU.

1.6. Two new madvise() flags: MADV_COLD and MADV_PAGEOUT

In order to improve memory usage in some systems (notably, Android), two new madvise() flags have been added: MADV_COLD and MADV_PAGEOUT. These new options complement MADV_DONTNEED and MADV_FREE by adding non-destructive ways to gain some free memory space.

MADV_COLD hints the kernel that the pages can be reclaimed when memory pressure happens but data should be preserved for future use, this can reduce workingset eviction so it ends up increasing performance. In contrast to MADV_FREE, the contents of the region are preserved regardless of subsequent writes to pages. MADV_PAGEOUT can be used by a process to mark a memory range as not expected to be used for a long time so that kernel reclaims *any LRU* pages instantly. The hint can help kernel in deciding which pages to evict proactively. Access in the range after successful operation could cause major page fault but never lose the up-to-date contents unlike MADV_DONTNEED

1.7. EROFS and exFAT

This release moves the EROFS file system out of the staging area. First included in Linux 4.19, EROFS is a lightweight read-only file system with a modern design aimed for scenarios which need high-performance read-only requirements, e.g. firmware in mobile phone or Livecds. Recommended LWN article: On-disk format robustness requirements for new filesystems

This release also adds the exFAT file system to the staging area. Recommended LWN article: Examining exFAT

1.8. More efficient polling in virtualized guests with haltpoll

This release includes a haltpoll cpuidle driver and a new matching governor. These two pieces allows guest vcpus to poll for a specified amount of time before halting, which provides the following benefits to host side polling: 1) The POLL flag is set while polling is performed, which allows a remote vCPU to avoid sending an IPI (and the associated cost of handling the IPI) when performing a wakeup. 2) The VM-exit cost can be avoided. The downside of guest side polling is that polling is performed even with other runnable tasks in the host. For more details see the documentation

1.9. More accurate cgroup I/O control with blk-iocost

One challenge of controlling I/O resources is the lack of reliability of trivial cost metrics. Bandwidth and iops can be off by orders of magnitude depending on the device type and I/O pattern. This is challenging for the I/O cgroup controllers: while io.latency provides the capability to comprehensively prioritize and protect IOs depending on the cgroups, its protection is binary - the lowest latency target cgroup is protected at the cost of all others.

This release introduces blk-iocost, an I/O cost model based work-conserving proportional controller. It currently has a simple linear cost model builtin where each I/O is classified as sequential or random and given a base cost accordingly and additional size-proportional cost is added on top. Each I/O is given a fairly reliable cost, and distributes I/O capacity for each cgroup according to their hierarchical weight. For more details, see the cgroup documentation for io.cost.qos and io.cost.model

Recommended LWN article: The io.weight I/O-bandwidth controller (the io.weight name is no longer used)

1.10. Kernel symbol namespacing

In order to support modules, the kernel needs to export the symbols of functions needed by modules. With more than 30k of those symbols existing in the current kernel, managing the symbols is sometimes messy. This feature allows allows subsystem maintainers to partition and categorize their exported symbols into explicit namespaces, which makes easier to control the use of symbols. Module authors are now required to import the namespaces they need.

For more details, read the documentation

Recommended LWN article: Kernel symbol namespacing

2. Core (various)

• (FEATURED) fs-verity: read-only file-based authenticity protection. fs-verity is similar to dm-verity, but implemented on a per-file basis: a Merkle tree is used to measure (hash) a read-only file's data as it is paged in. In general, fs-verity is intended for use on writable filesystems; dm-verity is still recommended on read-only ones. Support is added for Ext4 and F2FS file systems commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• fscrypt: Makes major improvements to how keys are added, removed, and derived in fscrypt, aka ext4/f2fs/ubifs encryption. It does this by adding new ioctls that add and remove encryption keys directly to/from the filesystem, and by adding a new encryption policy version ("v2") where the user-provided keys are only used as input to HKDF-SHA512 and are identified by their cryptographic hash commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• Task scheduler

  • topology: Improve load balancing on AMD EPYC systems commit

  • Extend the CPU cgroup controller with uclamp.min and uclamp.max to allow the finer shaping of CPU bandwidth usage commit, commit, commit, commit, commit, commit

  • Speed-up energy-aware wake-ups from O(CPUS^2) to O(CPUS) commit

  • Improve the behavior of high CPU count, high thread count applications running under cpu.cfs_quota_us constraints commit

  • Improve balancing with SCHED_IDLE (SCHED_BATCH) tasks present commit

  • Improve CPU isolation housekeeping CPU allocation NUMA locality commit

  • Convert the cpuset_mutex to percpu_rwsem, to allow it to be used from setscheduler() system calls without creating global serialization commit

• io_uring

  • IORING_OP_TIMEOUT support, a functionality similar to io_getevents() and epoll_wait(), where the user can specify a timeout for waiting on events commit

  • Improvement to the io_uring CQ ring wakeup for batched IO commit

  • Allocate SQ/CQ ring together, more efficient. Expose this through a feature flag as well, so we can reduce the number of mmaps by 1 commit, commit

  • Support SQ poll wakeup + event get in single io_uring_enter commit

  • Add support for links with drain commands commit

  • Increase IORING_MAX_ENTRIES from 4K to 32K commit

  • Limit parallelism of buffered writes commit

• waitid() system call

  • Add P_PIDFD flag, which adds the ability to wait on processes using pidfds. This is one of the few missing pieces to make it possible to manage processes using only pidfds commit

• Add support for waiting for the current process group commit

• Symbol Namespaces. It adds namespacing to the symbols used by kernel modules. This feature allows subsystem maintainers to partition their exported symbols into separate namespaces, limit availability of these namespaced symbols to other parts of the kernel. For more details read the documentation. commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• VFS: adds a per-superblock minimum/maximum timestamp limit for a file system, and clamps timestamps as they are written, to avoid random behavior from integer overflow as well as having different time stamps on disk vs in memory. This helps futimens(), utimensat() and utimes() syscalls to conform to POSIX defined behavior when the time being set is outside of the corresponding filesystem's supported limits commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• Preparations for PREEMPT_RT

  • (hr)timers: Prepare for PREEMPT_RT support commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • posix-timers: Prepare for PREEMPT_RT - part 1 commit, commit, commit, commit, commit, commit

  • Enforce interrupt threading at compile time on RT commit

• Add binder state and statistics to binderfs commit, commit, commit, commit

• kexec: add generic support for elf kernel images commit, commit, commit, commit, commit, commit, commit

• Update the interrupt spreading code so it handles numa node with different CPU counts properly commit, commit

• RCU

  • Add kernel parameter to dump trace after RCU CPU stall warning commit

  • Harden list_for_each_entry_rcu() and family commit, commit, commit, commit, commit, commit

• Improve rwsem scalability commit

• lockdep: Report more stack trace statistics commit

• Prohibit writing to active swap files and swap partitions commit, commit

• lkdtm: Add Control Flow Integrity test commit

• kbuild: remove SUBDIRS support commit

3. File systems

• XFS

  • Speed up large directory modifications. It makes growing large directories much faster by avoiding unnecessary processing during free space searches commit, commit, commit, commit, commit

• F2FS

  • Casefolding support commit, commit, commit

  • Support FS_IOC_{GET,SET}FSLABEL commit

  • Support fiemap for directory commit

• CIFS

  • Introduces a new kernel command-line option called cifsroot= which will tell the kernel to mount the root file system over the network by utilizing SMB or CIFS protocol commit

  • Add support to send smb2 set-info commands from userspace commit

  • Allow chmod to set mode bits using special sid commit, commit

  • Add cache=singleclient mount option to allow shares accessed by only client to be more aggressively cached commit

  • Allow share to be mounted with cache=ro if immutable share commit

  • Add ioctl to dump decryption keys for debugging commit

  • Allow disabling requesting leases commit

  • Allow parallelizing decryption of reads commit

  • Allow skipping signature verification for perf sensitive configurations commit

  • Display max smb3 requests in flight at any one time commit

  • Enable offload of decryption of large reads via mount option commit

• ext4

  • Add ioctl EXT4_IOC_CLEAR_ES_CACHE to force an inode's extent status cache to be cleared out, intended for debugging commit

  • Add ioctl EXT4_IOC_GETSTATE, it returns some of the dynamic state of an ext4 inode, intended for debugging commit

  • Add ioctl EXT4_IOC_GET_ES_CACHE, it returns the contents of the extent. Intended for debugging commit

• AFS

  • afs: Support RCU pathwalk commit

• Ceph

  • Allow arbitrary security.* xattrs commit

  • Automatic recovery of a blacklisted filesystem session. This is disabled by default and can be enabled by mounting with the recover_session=clean boot option commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Allow copy_file_range() within the same inode and across different filesystems within the same cluster commit

• Btrfs

  • Integrity checker: add tree-checker support for extent and root items commit, commit, commit, commit

  • sysfs: add debugging exports commit

• NFS

  • Add a new knfsd file descriptor cache, so that the kernel doesn't have to open and close on each (NFSv2/v3) READ or WRITE. This can speed up read and write in some cases. It also replaces the readahead cache commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Handling NFSv3 I/O errors in knfsd commit, commit, commit, commit

  • Optimise the default readahead size commit

  • Add hash of the kerberos principal to the data being tracked by nfsdcld commit, commit

  • Enable pNFS filelayout LAYOUTGET on OPEN commit

• UDF

  • Support 2048-byte spacing of VRS descriptors on 4K media commit

4. Memory management

• (FEATURED) Introduce madvise() flags MADV_COLD, which marks pages as inactive (thus more easily reclaimed under memory pressure), but doesn't discard the contents like MADV_FREE does, and MADV_PAGEOUT, which reclaims pages immediately, but doesn't discard the contents like MADV_DONTNEED does. commit, commit, commit, commit

• Memory control group

  • Extend the shrink file to shrink all memcg caches for the slab cache. Before the commit, writing 1 to /sys/kernel/slab/<slab>/shrink was shrinking only the root cache. With SLUB_MEMCG_SYSFS_ON enabled and slub_memcg_sysfs=1 used, it was possible to shrink also memcg caches, but it was impractical. Now all memcg caches will be shrunk when writing to the "global" shrink file. commit

  • Throttle allocators when reclaim cannot keep up with v2 memory.high limit commit

  • Introduce gradual reclaim pressure between v2 memory.low and memory.min thresholds instead of the previous cliff behaviour. commit, commit, commit

  • Improve situation with multiple parallel reclaimers by letting each walk through the whole cgroup tree, resulting in fewer premature OOM kills. commit

  • Deprecate v1 kmem.limit_in_bytes due to causing unexpected ENOMEM failures and global OOM's. commit

  • Prevent premature OOM's due to deferred Transparent Huge Page split queue. commit, commit, commit, commit

  • Implement foreign inode flushing to avoid pathological cases when two different cgroups are writing to the same inode commit, commit, commit, commit, commit

• Experimentally enable Transparent Huge Page support for text section (executable code) of non-shmem files (CONFIG_READ_ONLY_THP_FOR_FS) commit, commit, commit, commit, commit, commit, commit

• Change the handling of Transparent Huge Page faults so that they are tried first on a local NUMA node with no memory reclaim allowed, and if they not succeed, for madvise(MADV_HUGEPAGE) areas retry on all nodes, allowing reclaim. This should prevent swap storms observed on pre-5.3 kernels with some workloads and also fix the reported regression for a different workload on 5.3 kernel. LWN merge, commit, commit commit commit, commit

• Make uprobes uprobe Transparent Huge Page-aware. Instead of splitting whole THP when installing uprobe, split only the huge PMD, and reinstate it after uprobes are removed. commit commit, commit, commit, commit, commit

• kmemleak: make it more robust during early allocations (before slab subsystem is initialized) by using a single memory pool commit, commit, commit, commit, commit, commit,

• KASAN: for software tag-based mode, enhance the memory corruption report with a guess whether it is "use-after-free" or "out-of-bound" error instead of "invalid-access" error. commit

• page_owner: store also the stack of who last freed the page and print it in dump_page() to improve debugging double free or use-after-free, especially when debug_pagealloc or KASAN are also enabled commit, commit, commit, commit, commit commit

• oom: add task UID, oom_score_adj and pgtables to OOM message commit, commit

• Provide a generic top-down mmap layout implementation commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• zswap: let zswap use movable memory with zsmalloc commit, commit

• Guarantee alignment to size for kmalloc() allocations of power-of-two size, regardless of used sla*b allocator and activated debugging functions. Recommended LWN article LWN followup. commit, commit

• Fix minutes or hours long stalls when setting nr_hugepages to too high values. commit, commit, commit, commit,

5. Block layer

• (FEATURED) Support for blk-iocost, a IO cgroup controller that uses a model that can properly account cost of IO workloads commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• bfq: add to BFQ the missing per-device weight interfaces: blkio.bfq.weight_device on legacy and io.bfq.weight on cgroups v2 commit, commit, commit

• Introduce a new request operation REQ_OP_ZONE_RESET_ALL that reset all zones. This is useful for the applications like mkfs commit, commit, commit, commit

• Device Mapper (dm)

  • (FEATURED) Add dm-clone target, which allows cloning of arbitrary block devices commit

  • writecache: Optimize writecache writeback for performance commit, commit, commit

  • dm verity: add root hash pkcs#7 signature verification. The verification is to support cases where the root hash is not secured by Trusted Boot, UEFI Secureboot or similar technologies commit

  • Introduce DM_GET_TARGET_VERSION. It will load a target that is specified in the "name" entry in the parameter structure and return its version. commit

• md/raid0: Add module and feature flag to avoid RAID0 data corruption due to layout confusion commit, commit

• md: allow last device in RAID1/RAID10 to fail and be removed commit, commit, commit

• Remove now unused elevator boot argument commit

6. Tracing, perf and BPF

• Addition of multiprobes to kprobe and uprobe events: support more than on probe in the same location commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• BPF

  • flow_dissector: pass input flags to BPF flow dissector program, so it can customize parsing by either stopping early or trying to parse as deep as possible commit, commit, commit, commit, commit, commit, commit

  • xdp: Add devmap_hash map type for looking up devices by hashed index commit, commit, commit, commit, commit, commit

  • Add BTF ids in procfs for file descriptors to BTF objects commit

  • Add a new command BPF_BTF_GET_NEXT_IDto the bpf() system call, and uses it in bpftool as to list all BTF objects (bpftool btf list) loaded on the system (and to dump the ids of maps and programs associated with them, if any) commit, commit, commit, commit, commit

  • Introduce BPF_F_TEST_STATE_FREQ flag to stress test parentage chain and state pruning commit

  • Expose BTF info through /sys/kernel/btf. It contains all the BTFs present inside kernel. Currently there is only kernel's main BTF, represented as /sys/kernel/btf/vmlinux file. Once kernel modules' BTFs are supported, each module will expose its BTF as /sys/kernel/btf/<module-name> file commit, commit

  • Implement the central part of CO-RE (Compile Once - Run Everywhere, an strategy to allow redistributable BPF binaries, see this and this) commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Introduce a BPF helper to generate SYN cookies commit, commit, commit, commit, commit, commit

  • bpftool: add net attach/detach command to attach XDP prog commit, commit, commit, commit

  • bpftool: work with frozen maps commit, commit

  • bpftool: add support for reporting the effective cgroup progs commit

• perf

  • Initial libperf separation - check out tools/perf/lib and the initial documentation. commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • perf list: Allow plurals for metric, metricgroup commit

  • perf record: Add an option to take an AUX snapshot on exit commit

  • Add --switch-on/--switch-off events in perf report commit, perf top commit, perf trace commit, perf script commit, commit, commit

  • Collect LBR callstack together with thread stack data commit, commit, commit

  • Add support for PEBS output to Intel PT commit, commit, commit, commit, commit, commit, commit

7. Virtualization

• (FEATURED) Add virtio-fs commit, commit

• vfio/type1: Introduce an iova list associated with a vfio iommu. User-space can retrieve valid iova ranges using VFIO_IOMMU_GET_INFO ioctl capability chains commit, commit, commit, commit, commit, commit

8. Cryptography

• CAESAR competition followup: remove aegis128l, aegis256 and morus, add better support for aegis128 commit, commit, commit, commit, commit, commit, commit, commit

• Create an ESSIV template that produces a skcipher or AEAD transform based on a tuple of the form '<skcipher>,<shash>' (or '<aead>,<shash>' for the AEAD case). It exposes the encapsulated sync or async skcipher/aead by passing through all operations, while using the cipher/shash pair to transform the input IV into an ESSIV output IV

• essiv - create wrapper template for ESSIV generation commit, commit, commit, commit, commit, commit

• Make NETLINK_CRYPTO work inside netns commit

• xts: add support for ciphertext stealing commit

9. Security

• Appended signatures support for IMA appraisal. The kernel image on Power servers is an ELF binary, which are signed using the scripts/sign-file tool and thus use the same signature format as signed kernel modules. This release adds support in IMA for verifying those signatures. It adds flexibility to OpenPOWER secure boot, because it allows it to boot kernels with the signature appended to them as well as kernels where the signature is stored in the IMA extended attribute commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• LSM: Add security hook for fs notifications(fanotify, inotify, dnotify) commit

• (FEATURED) LSM: Add kernel lockdown functionality commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

10. Power Management

• Expose suspend stats in sysfs commit

• Show wakeup sources stats in sysfs under /sys/class/wakeup/wakeup<ID>/ commit

• (FEATURED) Introduce a new haltpoll cpuidle driver and a new matching governor for virtualized guests wanting to do guest-side polling in the idle loop commit, commit, commit, commit, commit, commit, commit, commit, commit, commit,

• EFI: Export Runtime Configuration Interface table to sysfs commit

• ACPI

  • PPTT: Add support for ACPI 6.3 thread flag commit

  • s2idle: Add acpi.sleep_no_lps0 module parameter to prevent the ACPI LPS0 _DSM functions from being invoked commit

• pm-graph v5.5 commit

11. Networking

• Increase SOMAXCONN (/proc/sys/net/core/somaxconn) from 128 to 4096 commit

• TCP

  • Increase tcp_max_syn_backlog default to 4096 to match the recent SOMAXCONN change commit

  • Add a TCP_INFO counter that tracks out-of-order packet reception. It will allow understanding to what degree receive-heavy sockets are experiencing out-of-order delivery and packet drops indicating congestion. Please note that this is similar to the counter in NetBSD TCP_INFO, and has the same name commit

  • Add a TCP_INFO counter that tracks peer's advertised receive window after scaling commit

  • Add new tcp_mtu_probe_floor sysctl. The current implementation of TCP MTU probing can considerably underestimate the MTU on lossy connections. This sysctl allows to set a larger floor commit

• IPv4/6: support setting SO_MARK for UDP and RAW sockets using cmsg. This is analogous to existing support for TOS, TTL, txtime, etc. commit

• IPv6: add support for RFC7710 RA Captive Portal Identifier commit

• Netfilter

  • Support for updating stateful objects, this also includes the initial client for this infrastructure: the quota extension commit, commit

  • nft_synproxy: add synproxy stateful object support commit

  • Add offload support the vlan and tunnel device offload through indr-block architecture commit, commit, commit, commit, commit, commit

  • nfnetlink_log: add support for VLAN information commit

  • Add offload support for bitwise operation commit

  • nft_dynset: implements the delete operation from the ruleset commit

  • Introduce meta matches in the kernel for time, day, and hour commit

  • Support for fwd and dup offload commit

• Wireless

  • Association timestamp recording commit, commit

  • Add cfg80211 support for 6 GHz band, proposed in standard 802.11ax D4.0 commit, commit, commit, commit, commit, commit, commit, commit

  • Add HE TX rate reporting to radiotap commit, commit, commit

  • Add ADDBA_EXT responder support commit, commit

  • HE mesh support commit, commit

  • Add support for new channels on 60 GHz band and EDMG channel commit, commit

• Add drop packet monitor for offloaded data paths commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• bridge: makes the bridge dump host-joined mdb entries, they should be treated as normal entries since they take a slot and are aging out commit, commit, commit, commit

• devlink: send notifications for deleted snapshots on region destroy commit

• dsa: ksz: Add KSZ8795 tag code commit

• ethtool: implement Energy Detect Powerdown support via phy-tunable commit

• packet scheduler

  • fq_codel: Two small fq_codel optimizations commit, commit

  • act_police: add 2 new attributes to support police 64bit rate and peakrate commit

• Bluetooth

  • Add support for utilizing Fast Advertising Interval commit

• Infiniband/RDMA

  • iser: Support up to 16MB data transfer in a single command commit

  • Add a counter for credit waits to assist field debugging commit

  • Add common iWARP query port commit

  • Support netlink commands in non init_net net namespaces commit

  • Expose device statistics commit

• can

  • Add SAE J1939 protocol commit, commit, commit, commit

  • gw: add support for CAN FD frames commit

• batman-adv: Add OGMv2 per-interface queue and aggregations commit, commit

• ncsi: Disable global multicast filter commit

• RDS: Add RDS6_INFO_SOCKETS and RDS6_INFO_RECV_MESSAGES options commit

• SCTP: support per endpoint auth and asconf flags commit, commit, commit, commit, commit, commit, commit, commit

• TIPC: Add loopback device tracking commit

• devmap: adds a new map type, devmap_hash, that works like the existing devmap type, but using a hash-based indexing scheme. This is useful for the use case where a devmap is indexed by ifindex (for instance for use with the routing table lookup helper) commit, commit, commit, commit, commit, commit

12. Architectures

12.1. ARM

• SoC changes

  • Support for the new ASpeed AST2600 gets added, this is based on the Cortex-A7 ARMv7 core, and is a newer version of the existing ARMv5 and ARMv6 chips in the same family commit

  • TI Davinci and NXP LPC32xx platforms have been converted to the ARCH_MULTIPLATFORM build, meaning that it is possible to compile a kernel that works on these along with most other ARMv5 platforms commit, commit

  • The Kendin/Micrel/Microchip KS8695, Winbond/Nuvoton W90x900 and Intel IOP33x/IOP13xx platforms are removed after it was determined that nobody is using them any more commit, commit, commit

• Device Tree changes

  • The Snapdragon 855 (SM8150) is Qualcomm's current high-end phone platform, usually paired with an external 5G modem. So far we only support the Qualcomm SM8150 MTP reference platform, but no actual products commit, commit, commit, commit, commit

  • For the slightly older Qualcomm platforms, support for several interesting products is getting added: Three laptops based on Snapdragon 835/MSM8998 (Asus NovaGo TP370QL commit, HP Envy X2 commit and Lenovo Miix 630 commit), one laptop based on Snapdragon 850/sdm850 (Lenovo Yoga C630 commit) and several phones based on the older Snapdragon 410/MSM8916 (Samsung Galaxy A3 and A5 commit, Longcheer L8150 aka Android One 2nd gen "seed" aka Wileyfox Swift commit)

  • Mediatek MT7629 is a new wireless network router chip, similar to the older MT7623. It gets added together with the reference board implementation commit

  • Allwinner V3 is a repackaged version of the existing low-end V3s chip, and is used in the tiny Lichee Pi Zero plus, also added here commit. There is also a new TV set-top box based on Allwinner H6, the Tanix TX6 commit, and the eMMC variant of the Olimex A64-Olinuxino development board commit

  • NXP i.MX8M Nano is a new member of the ever-expanding i.MX SoC family, similar to the i.MX8M Mini commit, commit. As usual, there is a large number of new boards for i.MX SoCs: !Einfochips i.MX8QXP AI_ML commit, SolidRun Hummingboard Pulse baseboard and System-on-Module commit, Boundary Devices i.MX8MQ Nitrogen8M commit, and TechNexion PICO-PI-IMX8M-DEV for the 64-bit i.MX8 line commit. For 32-bit, we get the Kontron i.MX6UL N6310 SoM commit with two baseboards, the PHYTEC phyBOARD-Segin SoM with three baseboards commit, and the Zodiac Inflight Innovations i.MX7 RMU2 board commit

  • In a different NXP product line, the Layerscape LS1046A "Freeway" reference board gets added commit

  • Amlogic SM1 (S905X3) and G12B (S922X, A311D) are updated chips from their set-top-box line and smart speaker with newer CPU and GPU cores compared to their predecessors. Both are now also supported by the Khadas VIM3 development board series commit and VIM3L commit. Another board based on SM1 that gets added is the SEI Robotics SEI610 commit

  • There are a handful of new x86 and Power9 server boards using Aspeed BMC chips that are gaining support for running Linux on the BMC through the OpenBMC project: Facebook Minipack commit, Wedge100 commit, Wedge40 commit, Lenovo Hr855xg2 commit, and Mihawk commit.

  • There are three new end-user products using 32-bit Rockchips SoCs: Mecer Xtreme Mini S6 is an Android "mini PC" box based on the low-end RK3229 chip commit, while the two AOpen products Chromebox Mini (Fievel commit) and Chromebase Mini (Tiger commit) run ChromeOS and are meant for commercial settings(digital signage, PoS, ...).

  • One more single-board computer based on the popular 64-bit RK3399 is added: the Leez RK3399 P710 commit

  • The new Aspeed AST2600 baseboard management controller is added, this is a Cortex-A7 based follow-up to the ARM11 based AST2500 commit

  • After many years, support for the MMP2 based OLPC XO-1.75 finally makes it into the kernel commit

  • The Armada 3720 based Turris Mox open source router platform commit

  • rockchip: remove rk3288 fennec board support commit

• UNWINDER_FRAME_POINTER implementation for Clang commit

• debug-ll: Add support for r7s9210 commit

• psci: cpuidle: Introduce PSCI CPUidle driver commit

• coresight: acpi: Static funnel support commit

• coresight: cpu-debug: Add support for Qualcomm Kryo commit

• perf: Add PMU event JSON files for ARM Cortex-A76 and, Neoverse N1 commit

• crypto

  • aes-ce: implement ciphertext stealing for CBC commit

  • aes-ce: implement ciphertext stealing for XTS commit

  • aes-ce: provide a synchronous version of ctr(aes) commit

  • aes-neonbs: implement ciphertext stealing for XTS commit

  • aes-neonbs: provide a synchronous version of ctr(aes) commit

  • ghash: provide a synchronous version commit

• ARM64

  • New ABI to allow tagged user pointers to be dereferenced by syscalls commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Add support for 52-bit kernel VAs using some of the machinery already introduced by the 52-bit userspace VA code in 5.0 commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Add support for function error injection commit

  • Add support for relocating the kernel with RELR relocations commit

  • exynos: Enable exynos-chipid driver commit

  • kasan: Switch to using KASAN_SHADOW_OFFSET commit

  • kexec_file: add rng-seed support commit

  • crypto

    • aes: implement support for XTS ciphertext stealing commit

    • aes-neonbs: implement ciphertext stealing for XTS commit

  • KVM: vgic: ITS translation cache commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

12.2. PowerPC

• Initial support for running on a system with an Ultravisor, which is software that runs below the hypervisor and protects guests against some attacks by the hypervisor commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• Support for building the kernel to run as a "Secure Virtual Machine", ie. as a guest capable of running on a system with an Ultravisor commit, commit, commit, commit, commit, commit, commit

• Add Firmware-Assisted Dump for PowerNV platform commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• Add the PowerPC name and the PPC_ELFNOTE_CAPABILITIES type in the kernel binary ELF note. This type is a bitmap that can be used to advertise kernel capabilities to userland commit, commit

• 64s/radix: introduce options to disable use of the tlbie instruction commit

• eeh: Add a eeh_dev_break debugfs interface commit and a debugfs interface to run an EEH check commit

• Use the generic dma coherent remap allocator commit

12.3. x86

• Add UMIP emulation/spoofing for 64-bit processes as well, because of Wine based gaming commit

• Enable a new AVX512 CPU instruction group/feature for enumeration in /proc/cpuinfo: AVX512_VP2INTERSECT commit

• Add Elkhart Lake, Tiger Lake and Airmont to Intel family commit, commit, commit

• amd_nb: Add PCI device IDs for family 17h, model 70h commit

• Disable Transactional Synchronization Extensions (TSX), as it may be used on certain processors as part of a speculative side channel attack commit, commit, commit, commit, commit, commit, commit, commit, commit

• Mitigation for CVE-2018-12207, a microarchitectural implementation issue that could allow an unprivileged local attacker to cause system wide denial-of-service condition commit, commit, commit, commit, commit, commit, commit

  • Remove MPX APIs commit

  • Remove X86_FEATURE_MFENCE_RDTSC commit

  • platform

    • chrome: cros_ec_chardev: Add a poll handler to receive MKBP events commit

    • asus-wmi: Add support for charge threshold commit

    • hp_accel: Add support for HP ZBook 17 G5 commit

    • thinkpad_acpi: Add ThinkPad PrivacyGuard commit

    • asus-nb-wmi: Support ALS on the Zenbook UX430UNR commit

    • touchscreen_dmi: Add info for the Irbis TW90 tablet commit

    • touchscreen_dmi: Add info for the Chuwi Surbook Mini tablet commit

    • touchscreen_dmi: Add info for the Trekstor Primebook C11B 2-in-1 commit

    • pmc_atom: Add Siemens SIMATIC IPC227E to critclk_systems DMI table commit

  • crypto

    • aes: drop scalar assembler implementations commit

    • xts: implement support for ciphertext stealing commit

  • hwtracing intel_th

    • msu-sink: An example msu buffer "sink" commit

    • msu: Introduce buffer interface commit

    • pci: Add Comet Lake PCH support commit

    • pci: Add Jasper Lake PCH support commit

  • perf

    • Add Comet Lake CPU support commit, commit, commit

    • Add Tiger Lake CPU support commit, commit, commit

    • msr: Add new CPU model numbers for Ice Lake commit, commit

    • vendor events amd: Add L3 cache events for Family 17h commit

    • vendor events intel: Add Icelake V1.00 event file commit an

    • vendor events intel: Add Tremontx event file v1.02 commit

    • vendor events: Remove P8 HW events which are not supported commit

  • KVM

    • Hyper-V: Add direct tlb flush support commit, commit

    • vmx: Emulate MSR IA32_UMWAIT_CONTROL commit

    • Add support for user wait instructions commit

  • vmware: Support for VMCALL/VMMCALL based hypercalls commit

12.4. S390

• Add support for IBM z15 machines commit

• crypto: Add SHA3 and CCA AES cipher key support in zcrypt commit, commit

• crypto: Add sysfs attributes to emit AES CIPHER key blobs commit

• zcrypt: CEX7S exploitation support commit

• zcrypt: new sysfs attributes serialnr and mkvps commit

• bpf: add JIT support for bpf line info commit and for multi-function programs commit

• perf cpum_sf: Support ioctl PERF_EVENT_IOC_PERIOD commit

• kasan: add kdump support commit

• qdio: enable drivers to poll for Output completions commit

• qdio: let drivers opt-out from Output Queue scanning commit

• qeth: add BQL support for IQD devices commit

• qeth: add TX NAPI support for IQD devices commit

• qeth: add xmit_more support for IQD devices commit

• qeth: collect accurate TX statistics commit

12.5. MIPS

• Add partial 32-bit huge page support commit

• BCM47XX: Add support for Netgear R6200 V1 commit

• Remove unused R4300 CPU support commit

• Remove unused R5432 CPU support commit

• Remove unused R8000 CPU support commit

• jz4740: Drop dead code commit

12.6. RISC-V

• Add perf callchain support commit, commit, commit

• Make mmap allocation top-down by default commit

• Implement sparsemem commit

12.7. User Mode Linux

• Add virtio vhost-user driver commit

• Added support for Unix socket transports and bess transport commit

• Add legacy tap support and rename existing vector to hybrid commit

12.8. PA-RISC

• Add assembly implementations for memset, strlen, strcpy, strncpy and strcat commit

• Add kexec support commit, commit

• Add kprobes on ftrace support commit

12.9. IA-64

• Remove the hpsim platform commit

• Remove the SGI UV simulator support commit

• Remove support for the SGI SN2 platform commit

12.10. Xtensa

• Add support for xtensa call0 ABI in userspace commit

12.11. MicroBlaze

• Use the generic DMA coherent remap allocator commit

12.12. ARC

• Allow perf on Big Endian configs commit

• HSDK platform updates commit, commit

13. Drivers

13.1. Graphics

• Add the content_type support for HDCP2.2. Along with that uevent is sent for each HDCP state change triggered within kernel commit, commit, commit, commit, commit, commit

• AMDGPU

  • (FEATURED) Navi12/14 support, arcturus and renoir APU support, Navi12 + Arcturus power features merge, merge, commit, commit

  • Add wipe memory on release flag for buffer creation commit, commit, commit

  • RAS support for GFX merge

• i915

  • (FEATURED) Initial tigerlake platform support commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • DSI properties commit

  • Add Missing PCI IDs commit

  • ehl: Add one additional PCH ID to MCC commit

  • Enable GTT cache by default commit

  • Turn on GuC/HuC auto mode commit

  • icl: Add missing device ID commit

  • Enable hotplug retry for some devices that need it commit, commit

  • Remove unused debugfs/i915_emon_status commit

• nouveau

  • Improved display color management commit, commit

  • gv100-: add support for plane zpos property commit

• vmwgfx

  • Evicition priority support commit

• msm

  • msm8998 display support commit

  • Better async commit support for cursor updates commit, commit

  • Add rotation property commit

• Etnaviv

  • Implement per-process address spaces on MMUv2 commit

  • Implement softpin commit

• komeda

  • Enable dual-link support commit

• imx

  • imx-ldb: Provide ddc symlink in connector's sysfs commit

  • imx-tve: Provide ddc symlink in connector's sysfs commit

• ingenic

  • Add support for Sharp panels commit

  • Add support for panels with 8-bit serial bus commit

• panfrost

  • Export GPU features register to userspace commit

  • * Allow userspace to mark BOs which can be freed when there is memory pressure commit, commit, commit

  • Per-fd address space support commit

• pl111

  • Support grayscale commit

• sun4i

  • Improve support for color encoding and range commit

  • Provide ddc symlink in sun4i hdmi connector sysfs directory commit

• omap

  • Add 'alpha' and 'pixel blend mode' plane properties commit

• panel

  • Add Novatek NT39016 panel support commit

  • Add driver for the LG Philips LB035Q02 panel commit

  • Add driver for the NEC NL8048HL11 panel commit

  • Add driver for the Sharp LS037V7DW01 panel commit

  • Add driver for the Sony ACX565AKM panel commit

  • Add driver for the Toppoly TD028TTEC1 panel commit

  • Add driver for the Toppoly TD043MTEA1 panel commit

  • Add support for Raydium RM67191 panel driver commit

  • jh057n00900: Add regulator support commit

  • simple: Add GiantPlus GPM940B0 panel support commit, commit

  • simple: Add Ortustech COM37H3M panel support commit

  • simple: Add Sharp LQ070Y3DG3B panel support commit

  • simple: Add Sharp LS020B1DD01D panel support commit

  • simple: Add support for Sharp LD-D5116Z01B panel commit

  • simple: Support TI nspire panels commit

• ast

  • Provide ddc symlink in connector sysfs directory commit

• bridge

  • ti-sn65dsi86: add debugfs commit

• Associate ddc adapters with connectors: It is difficult for a user to know which of the i2c adapters is for which drm connector. This change adds a symbolic link in connector's sysfs directory commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• gm12u320:

  • Add Grain Media GM12U320 driver v2 commit

• ipu-v3

  • Enable remaining 32-bit RGB V4L2 pixel formats commit, commit

• agp: remove the sgi-agp driver commit

• fbdev: remove w90x900/nuc900 platform drivers commit

• fbdev: Drop JZ4740 driver commit

13.2. Storage

• libnvdimm: Introduce a new sysfs 'frozen' attribute so that ndctl can reflect the "security-operations-allowed" state independently of the lock status commit

• SCSI

  • Add support for request batching commit, commit

  • hisi_sas: Add built-int self test support for phy loopback commit

  • hisi_sas: Snapshot AXI and RAS register at debugfs commit and snapshot HW cache of IOST and ITCT at debugfs commit

  • lpfc: Add MDS driver loopback diagnostics support commit

  • lpfc: Add NVMe sequence level error recovery support commit

  • lpfc: Support dynamic unbounded SGL lists on G7 hardware commit

  • mpt3sas: Add support for PCIe Lane margin commit

  • mpt3sas: Add sysfs to know supported features commit

  • mpt3sas: Introduce module parameter to override queue depth commit

  • mpt3sas: Support MEMORY MOVE Tool box command commit

  • qedf: Add support for 20 Gbps speed commit

  • smartpqi: add gigabyte controller commit

  • smartpqi: add module param for exposure order commit

  • smartpqi: add module param to hide vsep commit

  • smartpqi: add new pci ids commit

  • smartpqi: add pci ids for fiberhome controller commit

  • smartpqi: add sysfs entries commit

• NVM Express

  • Add TOS configuration for TCP and RDMA transports commit, commit, commit, commit, commit

  • pci: Add support for Apple 2018+ models commit

  • pci: Support shared tags across queues for Apple 2018 controllers commit

  • tcp: support simple polling commit

  • Add uevent variables for controller devices commit

  • Add Get LBA Status command opcode commit, commit, commit, commit

• ide: remove the sgiioc4 driver commit

• qla2xxx: remove SGI SN2 support commit

• qla1280: remove SGI SN2 support commit

13.3. Drivers in the Staging area

• (FEATURED) erofs: move erofs out of staging commit

• erofs: support bmap commit

• (FEATURED) exfat: add exFAT filesystem code to staging commit

• fsl-dpaa2/ethsw: Add network interface statistics commit

• greybus: move the greybus core to drivers/greybus commit, commit, commit

• imx7-media-csi: add i.MX6UL support commit

• imx: add csc/scaler mem2mem device commit

• qlge: Move drivers/net/ethernet/qlogic/qlge/ to drivers/staging/qlge/ commit

• rtl8723bs: Remove debugging information exposed via procfs commit

• hantro: Add support for H264 decoding commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• hantro: Enable VP8 decoding on RK3328 commit

• hantro: Support RK3399 VP8 decoding commit

• hantro: Add support for MPEG-2 decoding on RK3328 commit

• hantro: Add support for VP8 decoding on rk3288 commit

• media/bcm2048: remove driver commit

• davinci: remove vpfe driver commit

• USB: Move wusbcore and UWB to staging as it is obsolete commit

• fbtft: Remove fbtft_device commit

• fbtft: Remove flexfb commit

13.4. Networking

• ath9k: add loader for AR92XX (and older) pci(e) commit

• bluetooth: bcm: Add support for loading firmware for BCM4345C5 commit

• bnxt_en

  • Add TPA (GRO_HW and LRO) on 57500 chips commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Implements adapter health and error recovery commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• dsa

  • tc-taprio offload for SJA1105 DSA commit, commit, commit, commit, commit, commit

  • ksz: Add Microchip KSZ8795 DSA driver commit

  • microchip: add KSZ9477 I2C driver commit

  • microchip: add ksz9567 to ksz9477 driver commit

  • mt7530: Add support for port 5 commit

  • mv88e6xxx: add PTP support for MV88E6250 family commit

  • mv88e6xxx: add RXNFC support commit

  • mv88e6xxx: add support for MV88E6220 commit

  • mv88e6xxx: support 2500base-x in SGMII IRQ handler commit

• can

  • kvaser_pciefd: Add driver for Kvaser PCIEcan devices commit

  • m_can: Create a m_can platform framework commit

  • sja1000: f81601: add Fintek F81601 support commit

  • tcan4x5x: Add tcan4x5x driver to the kernel commit

  • xilinx_can: Add support for CANFD FD frames commit

• dpaa2-eth

  • Add new DPNI statistics counters commit

  • Add pause frame support commit

  • Remove support for changing link settings commit

• brcmfmac

  • Enable DFS offload commit

  • Add "reset" debugfs entry for testing reset commit

• enetc: Add mdio bus driver for the PCIe MDIO endpoint commit

• habanalabs

  • Add uapi to retrieve aggregate H/W events commit

  • Add uapi to retrieve device utilization commit

• hns3

  • Add ethtool_ops.set_channels support for HNS3 VF driver commit

  • Add link change event report commit

  • Add some statitics info to tx process commit

• i40e

  • Add drop mode parameter to set mac config commit

  • Add support for X710 device commit

  • Persistent LLDP support commit

  • Allow reset in recovery mode commit

• ice

  • Add stats for Rx drops at the port level commit

  • Support loading a Dynamic Device Personalization (DDP) package from lib/firmware onto the device commit, commit, commit, commit, commit

  • Add support for reporting link partner advertising commit

  • Update ethtool stats on-demand commit

• igb: Enable media autosense for the i350 commit

• igc: Add tx_csum offload functionality commit

• ionic: add the ionic driver, supporting the Pensando ethernet device commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• iwlwifi

  • mvm: add support for single antenna diversity commit

  • Add support for new scan request command version commit

  • Support per-platform antenna gain commit

  • Remove the d0i3 related module parameters commit

  • Remove the code under IWLWIFI_PCIE_RTPM commit

• mediatek: Add MT7628/88 SoC support commit

• mediatek: Add basic PHYLINK support commit

• mediatek: Re-add support SGMII commit

• mlx4/en_netdev: allow offloading VXLAN over VLAN commit

• mlx5

  • Add CREATE_PSV/DESTROY_PSV for devx interface commit

  • Add XRQ and SRQ support to DEVX interface commit, commit, commit, commit

  • RDMA RX RoCE Steering Support commit, commit, commit

  • Add support for software (driver managed) flow steering commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Add software backchannel and mlx5e HV VHCA stats commit, commit, commit, commit, commit, commit

  • Add device ID of upcoming BlueField-2 commit

  • Add flow counters bulk allocation and pool, to improve the performance of flow counter acquisition commit, commit

  • Ingress rate support for E-Switch vports commit

  • Add VNIC_ENV internal rq counter bits commit

  • Expose IP-in-IP capability commit

  • Add support for a new flag called need_wakeup in the AF_XDP Tx and fill rings. When this flag is set by the driver, it means that the application has to explicitly wake up the kernel Rx (for the bit in the fill ring) or kernel Tx (for bit in the Tx ring) processing by issuing a syscall. Poll() can wake up both and sendto() will wake up Tx processing only commit, commit, commit, commit, commit, commit, commit, commit

• mlx5e

  • Add a device internal drop counter to mlx5 ethtool stats commit

  • Add a new devlink health reporter for RX related errors commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Add the support for LAG TX port affinity distribution. When VF LAG is enabled, VFs netdevs will round-robin the TX affinity commit, commit

  • Support RSS for IP-in-IP and IPv6 tunneled packets commit

  • Add the support for ip-in-ip TX TSO and checksum offloads commit, commit

• mlxsw

  • Add devlink-trap support commit, commit, commit, commit, commit, commit

  • spectrum: Extend to support Spectrum-3 ASIC commit

  • Add ethtool counters to help debug the internal PTP implementation in mlxsw commit

  • Remove 56G speed support commit

• mscc: PTP Hardware Clock (PHC) support commit

• mt76
  • mt7615

    • Add 4 WMM sets support commit

    • Add hw support for AES_CMAC cipher commit, commit

    • Add Smart Carrier Sense support commit

    • Add hw dfs pattern detector commit, commit, commit, commit, commit

    • Add support to read temperature from mcu commit

    • mt7615: enable survey support commit

  • mt76x02u

  • Enable multi-vif support commit

  • Enable survey support commit

  • mt76x0u: add support to TP-Link T2UHP commit

• netdevsim

  • Add devlink-trap support commit

  • Implement support for devlink region and snapshots commit

• nfp

  • Implement firmware loading policy commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Support tunnels over VLAN in NFP commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • Offload MPLS actions commit, commit, commit, commit

• phy

  • Add mdio-aspeed commit

  • adin: add support for Analog Devices PHYs commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

  • adin: Add support for Analog Devices PHYs commit

  • adin: Implement Energy Detect Powerdown mode via phy-tunable commit

  • realtek: add support for integrated 2.5Gbps PHY in RTL8125 commit, commit, commit

  • realtek: add NBase-T PHY auto-detection commit

  • sfp: Add labels to hwmon sensors commit

• qed*: Support for dumping the config id attributes via ethtool -w/W commit, commit

• qed*: Support for dumping the GRC data of required memory regions using ethtool -w/W interfaces commit, commit

• qed: Add new ethtool supported port types based on media commit

• qmi_wwan: add support for Cinterion CLS8 devices commit

• r8152

  • Add device id for Lenovo ThinkPad USB-C Dock Gen 2 commit

  • Change rx_copybreak and rx_pending through ethtool commit

• r8169

  • Add support for RTL8125 commit

  • Add support for EEE on RTL8125 commit

  • Enable HW csum and TSO commit

  • Implement callback ndo_features_check commit

• rt2800usb: Add new rt2800usb device PLANEX GW-USMicroN commit

• rtw88

  • 8822c: enhance and stabilize the throughput performance commit, commit, commit, commit, commit, commit, commit, commit

  • add BT co-existence support commit

  • pci: enable MSI interrupt commit

  • debug: dump tx power indexes in use commit

• sis900: add support for ethtool's EEPROM dump commit

• stmmac

  • xgmac: Implement MMC counters commit

  • Add VLAN HASH filtering support in GMAC4+ commit

  • Add support for SA Insertion/Replacement in GMAC4+ commit

  • Add support for SA Insertion/Replacement in XGMAC cores commit

  • Add support for VLAN Insertion Offload commit

  • Add support for VLAN Insertion Offload in GMAC4+ commit

  • ARP Offload for GMAC4+ Cores commit

  • Implement RSS and enable it in XGMAC core commit

  • Implement Safety Features in XGMAC core commit

  • Implement VLAN Hash Filtering in XGMAC commit

  • Add Flexible RX Parser support in XGMAC commit

  • Add Split Header support and enable it in XGMAC cores commit

  • Add a counter for Split Header packets commit

  • Add ethtool register dump for XGMAC cores commit

  • Implement L3/L4 Filters using TC Flower commit

  • Add EHL and TGL PCI info and PCI ID commit, commit, commit

  • dwmac4: Enable RX Jumbo frame support commit

  • dwxgmac: Add Flexible PPS support commit

  • Add HAPS support using GMAC5 commit

  • xgmac: Add EEE support commit

  • xgmac: Enable RX Jumbo frame support commit

  • xgmac: Implement ARP Offload commit

• qmi_wwan

  • Add Telit 0x1050 composition commit

  • Add support for DW5821e with eSIM support commit

  • Add support for Foxconn T77W968 LTE modules commit

• wil6210: add debugfs to show PMC ring content commit

• Remove ks8695 driver commit

• Remove netx ethernet driver commit

• Remove w90p910-ether driver commit

• Remove broken dscc4 driver commit

13.5. Audio

• firewire: introduce AMDTP domain commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• pcm: add support for 352.8KHz and 384KHz sample rate commit

• usb-audio: Scarlett Gen 2 mixer interface commit

• hda

  • hdmi: Allow audio component for AMD/ATI and Nvidia HDMI commit

  • realtek: Add support for ALC623 commit

  • realtek: Add support for ALC711 commit

  • Add Tigerlake/Jasperlake PCI ID commit

  • Add support of Zhaoxin controller commit

  • hdmi: add Tigerlake support commit

  • Add Cometlake-S PCI ID commit

• lx6464es: add support for LX6464ESe pci express variant commit

• oxfw: support AMDTP domain commit

• Sound Open Firmware

  • topology: initial support for Intel ALH DAI type commit

  • pcm: add ALH support commit

  • Add OF DSP device support commit

  • Intel: hda: Enable jack detection commit

  • Intel: hda: add a parameter to disable MSI commit

  • Intel: initial support for Elkhart Lake commit

  • Intel: initial support for Tiger Lake commit

  • imx: Add i.MX8 HW support commit

• ASoC

  • Intel: boards: Add Cometlake machine driver support commit

  • Intel: sof-rt5682: add dmic dapm widget to support dmic PCM commit

  • codecs: Add uda1334 codec driver commit

  • cs47l15: Add codec driver for Cirrus Logic CS47L15 commit

  • cs47l92: Add codec driver for Cirrus Logic CS47L92 commit

  • fsl_sai: Add support for SAI new version commit

  • fsl_sai: Add support for imx7ulp/imx8mq commit

  • fsl_sai: Add support for imx8qm commit

  • jz4740: Drop lb60 board code commit

  • sun4i-i2s: Add support for DSP formats commit

  • sun4i-i2s: Support more channels commit

  • ti: davinci-i2s: Add S32_LE as support format commit

  • Remove w90x900/nuc900 platform drivers commit

• Soundwire

  • cadence_master: add debugfs register dump commit

  • cadence_master: add kernel parameter to override interrupt mask commit

  • intel: add debugfs register dump commit

  • intel_init: add kernel module parameter to filter out links commit

  • Add device tree support for slave devices commit

  • Add debugfs support commit

13.6. Tablets, touch screens, keyboards, mouses

• Add support for polling to input devices commit

• soc_button_array: add support for newer surface devices commit

• Add support for the FlySky FS-iA6B RC receiver commit

• HID

  • wacom: support named keys on older devices commit

  • wacom: add new MobileStudio Pro 13 support commit

  • multitouch: add support for the Smart Tech panel commit

  • logitech-dj: add support of the G700(s) receiver commit

  • hid-logitech-dj: add the new Lightspeed receiver commit

  • sb0540: add support for Creative SB0540 IR receivers commit

  • google: add magnemite/masterball USB ids commit

• Remove w90x900 keyboard driver commit

• Remove w90x900 touchscreen driver commit

13.7. TV tuners, webcams, video capturers

• v4l2-tpg: add support for new pixelformats commit

• v4l2-common: add support for new RGB32 pixelformats commit

• vivid: add support for new pixelformats commit

• RK3288 VP8 decoding support commit, commit, commit, commit

• vicodec: add support for 4 new RGB32 pixelformats commit

• Add support for Cadence CSI2TX 2.1 commit

• dvb-usb: add T230 to dvbsky commit

• dvbsky: add support for Mygica T230C v2 commit

• ov5640: Add support for flash and lens devices commit

• ov5675: Add support for OV5675 sensor commit

• Remote control

  • Add keymap for Amediatech X96-MAX remote commit

  • Add keymap for HardKernel ODROID remote commit

  • Add keymap for Khadas VIM/EDGE remote commit

  • Add keymap for Tanix TX3 mini remote commit

  • Add keymap for Tanix TX5 max remote commit

  • Add keymap for !WeTeK Play 2 remote commit

  • Add keymap for WeTek Hub remote commit

  • sunxi: Add A31 compatible commit

• rcar-vin: Add support for RGB formats with alpha commit, commit, commit, commit

• si2168: add support for Mygica T230C v2 commit

• stm32-dcmi: add media controller support commit

• stm32-dcmi: add support of several sub-devices commit

• sunxi: Add A10 CSI driver commit

13.8. Universal Serial Bus

• usbfs: Add ioctls for runtime power management commit

• usbip: Implement SG support to vhci-hcd and stub driver commit

• cdns3: Add Cadence USB3 DRD Driver commit

• Add USB GPIO based connection detection driver commit

• serial

  • ftdi_sio: add device IDs for Sienna and Echelon PL-20 commit

  • ftdi_sio: add support for FT232H CBUS gpios commit

  • option: add Telit FN980 compositions commit

  • option: add support for Cinterion CLS8 devices commit

• Add V4L2_FMT_FLAG_CONTINUOUS_BYTESTREAM commit and V4L2_FMT_FLAG_DYN_RESOLUTION commit

• gadget: aspeed: Implement dummy hub TT requests commit

• Remove ehci-w90x900 driver commit

• rio500: Remove Rio 500 kernel driver commit

13.9. Serial Peripheral Interface (SPI)

• dw-pci: Add support for Intel Elkhart Lake PSE SPI commit

• mediatek: support large PA commit

• npcm-fiu: add NPCM FIU controller driver commit

• Remove w90x900 driver commit

13.10. Watchdog

• Add i.MX7ULP watchdog support commit

• aspeed: Add support for AST2600 commit

• aspeed: add support for dual boot commit

• f71808e_wdt: Add F81803 support commit

• iTCO: Add support for Cannon Lake PCH iTCO commit

• Remove ks8695 driver commit

• Remove w90x900 driver commit

13.11. Serial

• 8250_pci: Add F81504A series Support commit

• 8250_pci: Add support for Sunix serial boards commit

• 8250_pci: Implement MSI(-X) support commit

• lantiq: Add support for Lightning Mountain SoC commit

• 8250: Add support for NI-Serial PXI/PXIe+485 devices commit

• Add linflexuart driver for S32V234 commit

• sprd: Add loopback function support commit

• tegra: Add PIO mode support commit

• tegra: add internal loopback functionality commit

• tegra: add support to adjust baud rate commit

• Remove ks8695 driver commit

• Remove the ioc3_serial driver commit

• Remove the ioc4_serial driver commit

• Remove the sn_console driver commit

13.12. CPU Frequency Scaling

• Add sun50i nvmem based CPU scaling driver commit

• Switch over some users of cpuidle notifiers to the new QoS-based frequency limits commit, commit, commit, commit, commit, commit, commit, commit, commit

• imx-cpufreq-dt: Add i.MX8MN support commit

• mediatek: Add support for mt8183 commit

• qcom: Add support for qcs404 on nvmem driver commit

13.13. Device Voltage and Frequency Scaling

• Introduce driver for NVIDIA Tegra20 commit

• tegra: Support Tegra30 commit

13.14. Real Time Clock (RTC)

• Add Amlogic Virtual Wake RTC commit

• fsl-ftm-alarm: add FTM alarm driver commit

• pcf2127: add tamper detection support commit

• pcf2127: add watchdog feature support commit

• sun6i: Add support for H6 RTC commit

• sun6i: Allow using as wakeup source from suspend commit

• Remove w90x900/nuc900 driver commit

13.15. Voltage, current regulators, power capping, power supply

• supply

  • bq25890_charger: Add the BQ25895 part commit

  • supply: sc27xx: Add POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN attribute commit

  • supply: Drop obsolete JZ4740 driver commit

• regulator

  • act8865: Add support for act8600 charger commit

  • Add support for SY8824C regulator commit

  • mt6358: Add support for MT6358 regulator commit

  • qcom-rpmh: Add support for SM8150 commit

  • sy8824x: add SY20276 support commit

  • sy8824x: add SY20278 support commit

  • sy8824x: add SY8824E support commit

13.16. Pin Controllers (pinctrl)

• Ingenic: Add pinctrl driver for JZ4760 and JZ4760B commit

• Ingenic: Add pinctrl driver for X1000 and X1000E commit

• Ingenic: Add pinctrl driver for X1500 commit

• aspeed: Add AST2600 pinmux support commit

• bcm2835: Add support for BCM2711 pull-up functionality commit

• madera: Add configuration for Cirrus Logic CS47L15 commit

• madera: Add configuration for Cirrus Logic CS47L92 commit

• qcom: Add SC7180 pinctrl driver commit

• sunxi: v3s: introduce support for V3 commit

13.17. Multi Media Card (MMC)

• sdhci-iproc: Add support for emmc2 of the BCM2711 commit

• sdhci-of-arasan: Add Support for Intel LGM eMMC commit

• sdhci-of-aspeed: Add support for the ASPEED SD controller commit

• sdhci-pci: Add another Id for Intel CML commit

13.18. Memory Technology Devices (MTD)

• mtdcore: add debugfs nodes for querying the flash name and id commit

• rawnand: Add Macronix raw NAND controller driver commit

• rawnand: remove w90x900 driver commit

• rawnand: Drop obsolete JZ4740 NAND driver commit

• spi-nor: Add Winbond w25q256jvm commit

• spi-nor: Add support for mt35xu02g commit

• spi-nor: add support for sst26wf016b memory IC commit

• spi-nor: enable the debugfs for the partname and partid commit

• spi-nor: intel-spi: Add support for Intel Tiger Lake SPI serial flash commit

13.19. Industrial I/O (iio)

• adc: ad7606: Add support for AD7606B ADC commit

• adc: ad7606: Add support for software mode for ad7616 commit

• adc: stm32-adc: add analog switches supply control commit

• cros_ec: Add calibscale for 3d MEMS commit

• cros_ec_accel_legacy: Add support for veyron-minnie commit

• imu: Add support for the ADIS16460 IMU commit

• imu: st_lsm6dsx: add i3c basic support for LSM6DSO and LSM6DSR commit

• imu: st_lsm6dsx: add support for accel/gyro unit of lsm9ds1 commit

• imu: st_lsm6dsx: add support to ISM330DHCX commit

• imu: st_lsm6dsx: add support to LSM6DS3TR-C commit

• light: noa1305: Add support for NOA1305 commit

• potentiometer: add a driver for Maxim 5432-5435 commit

• stm32: Remove quadrature related functions from trigger driver commit

13.20. Multi Function Devices (MFD)

• Add support for Merrifield Basin Cove PMIC commit

• intel-lpss: Add Intel Skylake ACPI IDs commit

• intel-lpss: Add Intel Tiger Lake PCI IDs commit

• mt6323: Add MT6323 RTC and PWRC commit

• Drop obsolete JZ4740 driver commit

13.21. Pulse-Width Modulation (PWM)

• mediatek: Add MT8516 SoC support commit

• sprd: Add Spreadtrum PWM support commit

13.22. Inter-Integrated Circuit (I2C + I3C)

• Add i2c-icy for I2C on m68k/Amiga commit

• axxia: support slave mode commit

• designware-pci: Add support for Elkhart Lake PSE I2C commit

• i2c-eeprom_slave: Add support for more eeprom models commit

• icy: Add LTC2990 present on 2019 board revision commit

• imx: ACPI support for NXP i2c controller commit

• piix4: Add ACPI support commit

13.23. Hardware monitoring (hwmon)

• Add Synaptics AS370 PVT sensor driver commit

• ibm-cffps: Add support for version 2 of the PSU commit

• k10temp: Add support for AMD family 17h, model 70h CPUs commit

• lm75: add support for PCT2075 commit

• nct6775: Integrate new model nct6116 commit

• nct7904: Add extra sysfs support for fan, voltage and temperature commit

• pmbus: Add Inspur Power System power supply driver commit

• shtc1: add support for the SHTC3 sensor commit

• Drop obsolete JZ4740 driver commit

• Remove ads1015 driver commit

13.24. General Purpose I/O (gpio)

• aspeed: Add SGPIO driver commit

• aspeed: Add in ast2600 details to Aspeed driver commit

• Add support for GPIOs over Moxtet bus commit

• madera: Add support for Cirrus Logic CS47L15 commit and Cirrus Logic CS47L92 commit

• Remove ks8695 driver commit

13.25. LEDs

• apu: drop superseeded apu2/3 LED support commit

• lm3532: Add full scale current configuration commit

13.26. DMA engines

• tegra-apb: Support per-burst residue granularity commit

• fsl-edma: add i.mx7ulp edma2 version support commit

• Drop JZ4740 driver commit

13.27. Cryptography hardware acceleration

• cavium/nitrox

  • Add support for loading asymmetric crypto firmware commit

  • Configure asymmetric queue manager Hardware unit commit, commit

• ccp: Add module parameters to control CCP activation commit, commit, commit, commit

• ccree

  • Drop legacy ivgen support commit

  • Enable CTS support in AES-XTS commit

• inside-secure

  • Add support for AES-GCM, AES-CFB, AES-OFB and AES-CCM commit, commit, commit, commit

  • inside-secure: Add AES-XTS cipher support commit, commit, commit,

  • inside-secure - add support for PCI based FPGA development board commit

  • inside-secure - add support for using the EIP197 without vendor firmware commit

  • inside-secure - Add supp. for non-Marvell HW commit, commit, commit, commit, commit, commit

  • inside-secure: add more AEAD ciphersuites commit, commit, commit

• hisilicon: Add HiSilicon QM and ZIP controller driver commit, commit, commit, commit, commit

• mediatek - add support to OFB/CFB mode commit

13.28. PCI

• dwc: al: Add Amazon Annapurna Labs PCIe controller driver commit

• mediatek: Add controller support for MT7629 commit

• tegra: Add Tegra194 PCIe support commit

• tegra: Add support to configure sideband pins commit

• tegra: Add support to enable slot regulators commit

• hotplug: remove the sgi_hotplug driver commit

13.29. Non-Transparent Bridge (NTB)

• ntb_hw_amd: Add a new NTB PCI device ID commit

13.30. Thunderbolt

• Add support for Intel Ice Lake commit, commit

13.31. Clock

• Add clk_min/max_rate entries in debugfs commit

• Add support for AST2600 SoC commit

• clk-cdce925: Add regulator support commit

• imx: Add support for i.MX8MN clock driver commit

• ingenic: Add driver for the TCU clocks commit

• mediatek: Add MT6779 clock support commit

• meson: g12a: add support for DVFS commit

• meson: meson-sm1: add support for DVFS commit, commit, commit

• meson: axg-audio: add g12a reset support commit

• mvebu: Add CPU clock support for Armada 7K/8K commit, commit, commit, commit

• mvebu: AP807 clocks support commit, commit, commit, commit, commit, commit

• qcom: clk-alpha-pll: Add support for Trion PLLs commit

• qcom: gcc: Add global clock controller driver for SM8150 commit

• rockchip: Add clock controller for the rk3308 commit

• sunxi-ng: v3s: add Allwinner V3 support commit

• Add a new timer-ingenic driver commit

13.32. PHY ("physical layer" framework)

• lantiq: vrx200-pcie: add a driver for the Lantiq VRX200 PCIe PHY commit

• mvebu-cp110-comphy: Enhance CP110 COMPHY support commit, commit, commit, commit, commit, commit, commit, commit, commit, commit, commit

• tegra: Add PCIe PIPE2UPHY support commit

13.33. EDAC (Error Detection And Correction)

• mellanox: Add ECC support for BlueField DDR4 commit

• amd64: Add PCI device IDs for family 17h, model 70h commit

• amd64: Support asymmetric dual-rank DIMMs commit

• Add driver for the Marvell Armada XP SDRAM and L2 cache ECC commit

13.34. Various

• NFC: nxp-nci: Add NXP1001 to the ACPI ID table commit

• PTP: add support for one-shot output commit

• PTP: introduce new versions of IOCTLs commit

• backlight: Expose brightness curve type through sysfs commit

• bus: Add support for Moxtet bus commit

• bus: moxtet: Add sysfs and debugfs documentation commit

• char/mspec: remove SGI SN2 support commit

• char: remove the SGI snsc driver commit

• char: remove the SGI tiocx/mbcs driver commit

• Remove the SGI SN2 IOC3 base support commit

• Remove the SGI SN2 IOC4 base support commit

• eeprom: Deprecate the legacy eeprom driver commit

• fdt: add support for rng-seed commit

• firmware: Add Turris Mox rWTM firmware driver commit

• firmware: add Intel Stratix10 remote system update driver commit

• firmware: arm_scmi: Add RESET protocol in SCMI v2.0 commit

• firmware: arm_scmi: Add discovery of SCMI v2.0 performance fastchannels commit

• firmware: arm_scmi: Make use SCMI v2.0 fastchannel for performance protocol commit

• firmware: imx: Add DSP IPC protocol interface commit

• fpga: altera-cvp: Add Stratix10 (V2) Support commit

• fpga: dfl: afu: add STP (SignalTap) support commit

• fpga: dfl: afu: add error reporting support commit

• fpga: dfl: afu: add userclock sysfs interfaces commit

• fpga: dfl: fme: add DFL_FPGA_FME_PORT_RELEASE/ASSIGN ioctl support commit

• fpga: dfl: fme: add capability sysfs interfaces commit

• fpga: dfl: fme: add global error reporting support commit

• fpga: dfl: pci: enable SRIOV support commit

• interconnect: Add support for path tags commit

• interconnect: qcom: Add QCS404 interconnect provider driver commit

• interconnect: qcom: Add interconnect RPM over SMD driver commit

• interconnect: qcom: Add tagging and wake/sleep support for sdm845 commit

• irqchip: Add irq-ingenic-tcu driver commit

• mailbox: qcom: Add support for IPQ8074 APCS commit

• mailbox: qcom: Add support for Qualcomm SM8150 and SC7180 SoCs commit

• mei: me: add comet point (lake) LP device ids commit

• memory: mtk-smi: Add gals support commit

• misc/sgi-xp: remove SGI SN2 support commit

• misc: Remove spear13xx pcie gadget driver commit

• misc: add the full Soft Decision Forward Error Correction (SD-FEC) driver implementation, driver DT binding and driver documentation commit, commit, commit, commit, commit, commit, commit

• parport: parport_serial: Add support for Sunix Multi I/O boards commit

• perf/imx_ddr: Add support for AXI ID filtering commit

• regulator: uniphier: Add Pro5 USB3 VBUS support commit

• remoteproc: Add a sysfs interface for name commit

• reset: Add support for resets provided by SCMI commit

• soc: amlogic: Add support for Everything-Else power domains controller commit

• soc: imx-scu: Add SoC UID(unique identifier) support commit

• soc: imx8: Add i.MX8MM UID(unique identifier) support commit

• soc: imx8: Add i.MX8MQ UID(unique identifier) support commit

• soc: qcom: Add socinfo driver commit

• soc: qcom: socinfo: Expose custom attributes commit

• soc: qcom: socinfo: Expose image information commit

• soc: samsung: Add exynos chipid driver support commit

• tpm/tpm_ftpm_tee: A driver for firmware TPM running inside TEE commit

• tty: n_gsm: add ioctl to map serial device to mux'ed tty commit

• w1: add 1-wire master driver for IP block found in SGI ASICs commit

• w1: add DS2501, DS2502, DS2505 EPROM device driver commit

14. List of Pull Requests

• pidfd/waitid updates

• tpm updates

• EDAC updates

• RAS updates

• hwmon updates

• regmap updates

• regulator updates

• spi updates

• i3c updates

• GPIO updates

• iommu updates

• arm64 updates

• m68k updates

• RISC-V updates

• ia64 updates

• parisc updates

• ARM SoC platform updates

• ARM SoC driver updates

• ARM SoC defconfig updates

• ARM DT updates

• RCU updates

• EFI updates

• locking updates

• perf updates

• scheduler updates

• x86 asm updates

• x86 boot code cleanup

• x86 build cleanup

• x86 cpu-feature updates

• x86 entry updates

• x86 mm updates

• x86 platform update

• x86 hyperv updates

• x86 vmware updates

• x86 platform-drivers updates

• CPU hotplug updates

• x86 pti updates

• x86 interrupt updates

• core irq updates

• x86 apic updates

• core timer updates

• OpenRISC updates

• s390 updates

• Xtensa updates

• asm-generic updates

• cgroup updates

• documentation updates

• io_uring updates

• libata updates

• block updates

• MMC updates

• sound updates

• media updates

• LED updates

• dmaengine updates

• power management updates

• ACPI updates

• device properties framework updates

• KVM updates

• driver core updates

• USB updates

• tty/serial driver updates

• staging and IIO driver updates

• char/misc driver updates

• crypto updates

• networking updates

• vfs namei updates

• vfs mount API infrastructure updates

• file locking updates

• fscrypt updates

• fs-verity support

• AFS updates

• btrfs updates

• swap access updates

• xfs updates

• y2038 vfs updates

• misc mount API conversions

• autofs updates

• orangefs updates

• cifs updates

• configfs updates

• dma-mapping updates

• Devicetree updates

• mailbox updates

• IPMI updates

• input updates

• chrome platform updates

• pin control updates

• drm updates

• Kbuild updates

• kgdb updates

• tracing updates

• powerpc updates

• VFIO updates

• clk updates

• ARM SoC late updates

• printk updates

• asm inline support

• hmm updates

• RDMA subsystem updates

• device mapper updates

• SCSI updates

• libnvdimm updates

• MTD updates

• UML updates

• UBI, UBIFS and JFFS2 updates

• ext4 updates

• ext2, quota, udf fixes and cleanups

• f2fs updates

• gfs2 updates

• MIPS updates

• ARM updates

• modules updates

• soundwire updates

• remoteproc updates

• rpmsg updates

• RTC updates

• power supply and reset updates

• selinux updates

• HID updates

• smack updates

• PCI updates

• backlight updates

• MFD updates

• more mount API conversions

• Hyper-V updates

• x86 platform-drivers fixes

• Microblaze updates

• memory management updates from akpm

• more block updates

• more io_uring updates

• i2c updates

• iomap updates

• fuse updates

• ceph updates

• more memory management updates from akpm

• xen update

• more s390 updates

• NFS client updates

• Kselftest updates

• more perf updates

• NTB updates

• watchdog updates

• thermal management updates

• more io_uring updates

• pwm updates

• more KVM updates

• more RISC-V updates

• 9p updates

• fuse virtio-fs support

• nfsd updates

• integrity updates

• kernel lockdown mode

• hugepage allocation updates

• more i2c updates

• thermal SoC updates

• libnvdimm updates

• active entropy generation updates

• more cifs updates

• more vfs updates

• Documentation/process update

• more MMC updates

• csky updates

15. Other news sites

• LWN's merge window part 1, part 2

• Phoronix Linux 5.4 Features Are Huge From exFAT To New GPUs To Enabling Lots Of New Hardware

• German: heise.de Linux 5.4 freigegeben: exFAT-Support und Einschränkungen für Root