• Linux_5.4

Linux 5.4 changelog.

This changelog is not complete, meanwhile you can read about it here:

• LWN's merge window part 1, part 2

or, instead, you can take a look at the list of merge 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

1. Memory management

• 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 behavior. 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 THP split queue. commit commit commit commit

• 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

• Experientally enable THP 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 THP 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 THP-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

• Introduce page_shift(), page_size() and compound_nr() to make common operations with compound pages simpler and more readable. commit commit 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

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

• Provide a generic top-down mmap layout implementation and use it for riscv. 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. LWN commit commit

1.1. 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

1.2. Pulse-Width Modulation (PWM)

• mediatek: Add MT8516 SoC support commit

• sprd: Add Spreadtrum PWM support commit

1.3. 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

1.4. 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

1.5. 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

1.6. Leds

• apu: drop superseeded apu2/3 led support commit

• lm3532: Add full scale current configuration commit

1.7. DMA engines

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

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

• Drop JZ4740 driver commit

1.8. 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

1.9. 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

1.10. Non-Transparent Bridge (NTB)

• ntb_hw_amd: Add a new NTB PCI device ID commit

1.11. Thunderbolt

• Add support for Intel Ice Lake commit

1.12. 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

1.13. 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

1.14. 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

1.15. 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

• can: add socket type for CAN_J1939 commit

• can: extend sockaddr_can to include j1939 members 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

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

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