Linux 4.9 [https://lkml.org/lkml/2016/12/11/102 has been released] on Sun, 11 Dec 2016.
Warning: This changelog is not completed. It will be finished in the future. Meanwhile, you can examine read about Linux 4.9 here:
LWN's 4.9 Merge window, [https://lwn.net/Articles/702590/ part 1], [https://lwn.net/Articles/703110/ part 2], [https://lwn.net/Articles/703779/ part 3]
Phoronix.com [http://www.phoronix.com/scan.php?page=article&item=linux-49-features&num=1 The Exciting Features Of The Linux 4.9 Kernel] or [http://www.phoronix.com/scan.php?page=news_item&px=Linux-4.9-Kernel-Highlights The Best Features Of The Linux 4.9 Kernel]
heise.de [https://www.heise.de/ct/artikel/Die-Neuerungen-von-Linux-4-9-3351436.html Die Neuerungen von Linux 4.9]
You can also examine the merge list:
[https://git.kernel.org/torvalds/c/7af8a0f8088831428051976cb06cc1e450f8bab5 Pull arm64 updates ]
[https://git.kernel.org/torvalds/c/72ec94560d7ee1d3a61d5904fd9a5bf68bf3b11a Pull power management updates ]
[https://git.kernel.org/torvalds/c/72d39926f098b0c4ad95e1461595a8d6d403c14d Pull ACPI updates ]
[https://git.kernel.org/torvalds/c/72a9cdd083005900f15934e8568f1ac43a6bb755 Pull PNP update ]
[https://git.kernel.org/torvalds/c/4b978934a440c1aafce986353001b03289eaa040 Pull RCU updates ]
[https://git.kernel.org/torvalds/c/d7a0dab82fef61bebd34f2bbb9314b075153b646 Pull core SMP updates ]
[https://git.kernel.org/torvalds/c/de956b8f45b3338cfb66a725e22b4050109daf2a Pull EFI updates ]
[https://git.kernel.org/torvalds/c/00bcf5cdd6c0e2e92ce3dd852ca68a3b779fa4ec Pull locking updates ]
[https://git.kernel.org/torvalds/c/12b7bcb43e6ea834ab2f5dc52d971e379a0ca109 Pull perf updates ]
[https://git.kernel.org/torvalds/c/e606d81d2d9596ab2b4fd0dc052eea0485b7e8c2 Pull RAS updates ]
[https://git.kernel.org/torvalds/c/af79ad2b1f337a00aa150b993635b10bc68dc842 Pull scheduler changes ]
[https://git.kernel.org/torvalds/c/110a9e42b68719f584879c5c5c727bbae90d15f9 Pull x86 apic updates ]
[https://git.kernel.org/torvalds/c/1a4a2bc460721bc8f91e4c1294d39b38e5af132f Pull low-level x86 updates ]
[https://git.kernel.org/torvalds/c/3ef0a61a467639cf7def299309cd9ea524c3e1c1 Pull x86 boot updates ]
[https://git.kernel.org/torvalds/c/a8adc0f0911227996b3e79690562e6e325e4c09b Pull x86 cleanups ]
[https://git.kernel.org/torvalds/c/a6c4e4cd44649b696038326f90161113d8569170 Pull x86 platform changes ]
[https://git.kernel.org/torvalds/c/6aebe7f9e8697531a11b007d1e8126ba1b6e0a53 Pull x86 timer updates ]
[https://git.kernel.org/torvalds/c/8e4ef6386703835f91898334b72e48649646ec00 Pull x86 vdso updates ]
[https://git.kernel.org/torvalds/c/5419e783829127dba712be769bce8c6a1ec0057e Pull m68k updates ]
[https://git.kernel.org/torvalds/c/49deffe0b0e4c2030696c7a6fd680bacf4761069 Pull ARC updates ]
[https://git.kernel.org/torvalds/c/5e1b834b27fb2c27cde33a0752425f11d10c0b2d Pull timer updates ]
[https://git.kernel.org/torvalds/c/999dcbe2414e15e19cdc1f91497d01f262c6e1cf Pull irq updates ]
[https://git.kernel.org/torvalds/c/597f03f9d133e9837d00965016170271d4f87dcf Pull CPU hotplug updates ]
[https://git.kernel.org/torvalds/c/7a53eea1f7b527fd3b6d7ca992914840981afe99 Pull char/misc driver updates ]
[https://git.kernel.org/torvalds/c/9929780e86854833e649b39b290b5fe921eb1701 Pull driver core updates ]
[https://git.kernel.org/torvalds/c/e6dce825fba05f447bd22c865e27233182ab3d79 Pull tty and serial updates ]
[https://git.kernel.org/torvalds/c/e6445f52d9c8b0e6557a45fa7d0e8e088d430a8c Pull usb/phy/extcon updates ]
[https://git.kernel.org/torvalds/c/f80fa1822d6ccca369578108dc70576cff6c67a0 Pull LED driver updates ]
[https://git.kernel.org/torvalds/c/77b0a4aa0732f1856aef85b8db085864e5971a14 Pull hwmon updates ]
[https://git.kernel.org/torvalds/c/5617c122e6015e2371c0bd6b5ad2e070844df24a Pull clk framework updates ]
[https://git.kernel.org/torvalds/c/808c2b0583f010d3993ae534980af55c43c1adba Pull regmap updates ]
[https://git.kernel.org/torvalds/c/5a9f228a183bc18bbc64a12a962adc2c7305782c Pull regulator updates ]
[https://git.kernel.org/torvalds/c/58e4411b2d05bea9992fd8ee510f696b73d314c1 Pull spi updates ]
[https://git.kernel.org/torvalds/c/19fe416532f798e199f04d25816b1bd36e48d6fe Pull EDAC updates ]
[https://git.kernel.org/torvalds/c/ce866e2d182b9e00e29e7a2eed4db908257d7f79 Pull hdi1 rdma driver updates ]
[https://git.kernel.org/torvalds/c/c35bcfd8e4e11bdff2ffab823a13a59968426b15 Pull file locking updates ]
[https://git.kernel.org/torvalds/c/5fdf4939dc66307daf30a3d5355a2bfb9d207676 Pull gfs2 updates ]
[https://git.kernel.org/torvalds/c/2105b9ff733c5e5ab3e0481f1c953ac3f7d7c44a Pull jfs updates ]
[https://git.kernel.org/torvalds/c/02bafd96f3a5d8e610b19033ffec55b92459aaae Pull documentation updates ]
[https://git.kernel.org/torvalds/c/e46cae441824999c858d482ca1f661cf4292c02f Pull s390 updates ]
[https://git.kernel.org/torvalds/c/3cd013ab79e8e5c58fbd50fc09fceb6260a92a68 Pull audit updates ]
[https://git.kernel.org/torvalds/c/a3443cda5588985a2724d6d0f4a5f04e625be6eb Pull security subsystem updates ]
[https://git.kernel.org/torvalds/c/687ee0ad4e897e29f4b41f7a20c866d74c5e0660 Pull networking updates ]
[https://git.kernel.org/torvalds/c/3fb75cb80d55d4b168e1e3250a01a548b1357148 Pull misc filesystem and quota fixes ]
[https://git.kernel.org/torvalds/c/edadd0e5a7f9970553423ebd08172c9e3d1fb189 Pull fuse updates ]
[https://git.kernel.org/torvalds/c/64cbd16a8751fde075aa103dc7823a8c05805104 Pull MMC updates ]
[https://git.kernel.org/torvalds/c/d268dbe76a53d72cc41316eb59e7968db60e77ad Pull pin control updates ]
[https://git.kernel.org/torvalds/c/6a497e9d5828120cf55c2aea508176d94cf7f5ba Pull GPIO updates ]
[https://git.kernel.org/torvalds/c/878fb5dc96b9dfae1de45be1b85aba40aca3356e Pull DeviceTree updates ]
[https://git.kernel.org/torvalds/c/5691f0e9a3e7855832d5fd094801bf600347c2d0 Pull sound updates ]
[https://git.kernel.org/torvalds/c/41844e36206be90cd4d962ea49b0abc3612a99d0 Pull staging and IIO updates ]
[https://git.kernel.org/torvalds/c/d8ea757b25ec82687c497fc90aa83f9bcea24b5b Pull Xtensa updates ]
[https://git.kernel.org/torvalds/c/a6930aaee06755d1bdcfd943fbf614e4d92bb0c7 Pull m68knommu updates ]
[https://git.kernel.org/torvalds/c/c7f5d36a3cc26e5068f4444aa22c4579e5eac85f Pull ARM fix ]
[https://git.kernel.org/torvalds/c/82fa407da081d05323171577d86f62d77df17465 Pull ARM updates ]
[https://git.kernel.org/torvalds/c/f84d9fa86820b3074a8c143444a6932c0c0fd019 Pull sparc updates ]
[https://git.kernel.org/torvalds/c/d230ec72c4efed7d0f414a80a756c54d4c422a6e Pull networking fixups ]
[https://git.kernel.org/torvalds/c/8d370595811e13378243832006f8c52bbc9cca5e Pull xfs and iomap updates ]
[https://git.kernel.org/torvalds/c/14986a34e1289424811443a524cdd9e1688c7913 Pull namespace updates ]
[https://git.kernel.org/torvalds/c/6218590bcb452c3da7517d02b588d4d0a8628f73 Pull KVM updates ]
[https://git.kernel.org/torvalds/c/541efb7632642cab55361178d73d544f025b593c Pull xen updates ]
[https://git.kernel.org/torvalds/c/95107b30be68953e3a4f1c3994c2233500502ccf Pull tracing updates ]
[https://git.kernel.org/torvalds/c/3940ee36a0565ea7fb848e3c798afe22efd0b90a Pull orangefs updates ]
[https://git.kernel.org/torvalds/c/0fb3ca447ddabcfb8dc7e0f719955e500b170cbd Pull pstore updates ]
[https://git.kernel.org/torvalds/c/4c1fad64eff481982349f5795b9c198c532b0f13 Pull f2fs updates ]
[https://git.kernel.org/torvalds/c/d880e5ad0df3c2e1d69bb356737a46abb5087d42 Pull remoteproc updates ]
[https://git.kernel.org/torvalds/c/521f3970853a4b2ff7f833763532bdba2ea11257 Pull rpmsg updates ]
[https://git.kernel.org/torvalds/c/553911c67eb701d46e2dcd073f603c6f6546c38b Pull dmaengine updates ]
[https://git.kernel.org/torvalds/c/c6594fc6af1924b7fdce600088b10e3b3b159fb7 Pull mailbox updates ]
[https://git.kernel.org/torvalds/c/021723e6c5a5e7b50eb68f9812418406de9860b2 Pull power supply and reset updates ]
[https://git.kernel.org/torvalds/c/9a687aea2ffd8ab1e3c6239ea53c0a2209707bd5 Pull HSI fix ]
[https://git.kernel.org/torvalds/c/3477d168ba61c5b0ca42d3d4642f3463609a5417 Pull backlight updates ]
[https://git.kernel.org/torvalds/c/d042380886fb2fc6c4b0fcfe1214ba473769a8e9 Pull MFD updates ]
[https://git.kernel.org/torvalds/c/d4e65476bc68dbc9231b3c772b71f1576579b6fb Pull input subsystem updates ]
[https://git.kernel.org/torvalds/c/4dfddf503670d8def0fddb497e628130fc4522a8 Pull SCSI updates ]
[https://git.kernel.org/torvalds/c/c23112e0395a89c8a52cd955442240de7fba46aa Pull MD updates ]
[https://git.kernel.org/torvalds/c/fbbea3899014c1a569a8f9aa9f4b11be1d4926a3 Pull VFIO updates ]
[https://git.kernel.org/torvalds/c/e6e3d8f8f4f06caf25004c749bb2ba84f18c7d39 Pull PCI updates ]
[https://git.kernel.org/torvalds/c/bc75450cc3db3485db1e289fef8c1028ba38296a Pull HID updates ]
[https://git.kernel.org/torvalds/c/ddc4e6d232d6b625a5686ec1aafe42b9e0109a4c Pull livepatching updates ]
[https://git.kernel.org/torvalds/c/2ab704a47e0f27df758840a589aec3298dbb98dd Pull trivial updates ]
[https://git.kernel.org/torvalds/c/87840a2b7e048018d18d60bdac5c09224de85370 Pull i2c updates ]
[https://git.kernel.org/torvalds/c/513a4befae06c4469abfb836e8f71977de58c636 Pull block layer updates ]
[https://git.kernel.org/torvalds/c/2eee010d092903ee95716b6c2fbd9d3289839aa4 Pull ext4 updates ]
[https://git.kernel.org/torvalds/c/d1f5323370fceaed43a7ee38f4c7bfc7e70f28d0 Pull VFS splice updates ]
[https://git.kernel.org/torvalds/c/07021b43597f506cc525d139ed1a94e79cf184f2 Pull powerpc updates ]
[https://git.kernel.org/torvalds/c/2c34ff14bf1d03a705f5400888ecac5b6400e981 Pull avr32 update ]
[https://git.kernel.org/torvalds/c/997b611baf7591ea5119539ee821a3e2f4fcf24e Pull parisc updates ]
[https://git.kernel.org/torvalds/c/a771151a8323a5ca81f443a9a439851b8a872c85 Pull ARM SoC cleanups ]
[https://git.kernel.org/torvalds/c/66f2c6d9525baa7534640f09f406cd2987e0f287 Pull ARM SoC platform updates ]
[https://git.kernel.org/torvalds/c/5acb6052ce304d89e36f599f1e27a7c63d389ca0 Pull ARM SoC defconfig updates ]
[https://git.kernel.org/torvalds/c/b4f33f6ddd0c218e12454e1379de3aaa73f2e8dc Pull ARM SoC 64-bit updates ]
[https://git.kernel.org/torvalds/c/6afd563d4bbc1924b7de9e053324c007e0d36476 Pull ARM SoC driver updates ]
[https://git.kernel.org/torvalds/c/00e729c933950cda694c49260ff67855fdbfd00a Pull ARM DT updates ]
[https://git.kernel.org/torvalds/c/a439f8f2879c68676eb74501ef9a6f187aeeec57 Pull ARM 64-bit DT updates ]
[https://git.kernel.org/torvalds/c/c913fc4146ba7c280e074558d0a461e5c6f07c8a Pull ARM SoC late DT updates ]
[https://git.kernel.org/torvalds/c/b66484cd74706fa8681d051840fe4b18a3da40ff Merge updates ]
[https://git.kernel.org/torvalds/c/1fde76f173e4d9aa205432c2ed5eff978d00deee Pull more rdma updates ]
[https://git.kernel.org/torvalds/c/b9044ac8292fc94bee33f6f08acaed3ac55f0c75 Pull main rdma updates ]
[https://git.kernel.org/torvalds/c/48915c2cbc77eceec2005afb695ac658fede4e0d Pull device mapper updates ]
[https://git.kernel.org/torvalds/c/12e3d3cdd975fe986cc5c35f60b1467a8ec20b80 Pull blk-mq irq/cpu mapping updates ]
[https://git.kernel.org/torvalds/c/24532f768121b07b16178ffb40442ece43365cbd Pull blk-mq CPU hotplug update ]
[https://git.kernel.org/torvalds/c/563873318d328d9bbab4b00dfd835ac7c7e28697 Merge my system logging cleanups, triggered by the broken '\n' patches.]
[https://git.kernel.org/torvalds/c/604a830d4fb5bf2334263bd597de22652e63b7e6 Pull timer fix ]
[https://git.kernel.org/torvalds/c/daba2b314a43c53be61eb98e0e88b094398196f5 Pull irq fixes ]
[https://git.kernel.org/torvalds/c/84ed2da02f4cda6759880c87a213ee80c91ca3bd Pull scheduler fix ]
[https://git.kernel.org/torvalds/c/c48ce9f190266b763e809dd79fcf4152f558793c Pull perf tooling updates ]
[https://git.kernel.org/torvalds/c/5fa0eb0b4d4780fbd6d8a09850cc4fd539e9fe65 Pull x86 updates ]
[https://git.kernel.org/torvalds/c/93c26d7dc02380fe11e57ff0d152368743762169 Pull protection keys syscall interface ]
[https://git.kernel.org/torvalds/c/057a056ced1ee7e000bad2a5c88241502747d350 Pull CRIS updates ]
[https://git.kernel.org/torvalds/c/ae50a840e779d48aa4dea2aaec1778f6b3f1d67f Pull nios2 update ]
[https://git.kernel.org/torvalds/c/911f9dab301e8583143c7e75b552eadd434ea0a8 Pull ARM pcmcia updates ]
[https://git.kernel.org/torvalds/c/abb5a14fa20fdd400995926134b7be9eb8ce6048 Pull misc vfs updates ]
[https://git.kernel.org/torvalds/c/fed41f7d039bad02f94cad9059e4b14cd81d13f2 Pull splice fixups ]
[https://git.kernel.org/torvalds/c/8dfb790b15e779232d5d4e3f0102af2bea21ca55 Pull Ceph updates ]
[https://git.kernel.org/torvalds/c/6763afe4b9f39142bda2a92d69e62fe85f67251c Pull dlm fix ]
[https://git.kernel.org/torvalds/c/30066ce675d3af350bc5a53858991c0b518dda00 Pull crypto updates ]
[https://git.kernel.org/torvalds/c/97d2116708ca0fd6ad8b00811ee4349b7e19e96f Pull vfs xattr updates ]
[https://git.kernel.org/torvalds/c/35ff96dfd3c9aaa921b3e8dcac76b7697f2dcec0 Pull MTD updates ]
[https://git.kernel.org/torvalds/c/101105b1717f536ca741f940033996302d4ef191 Pull more vfs updates ]
[https://git.kernel.org/torvalds/c/6b5e09a748ad0a0b198d0e268c7e689044bfe48a Pull networking fixes ]
[https://git.kernel.org/torvalds/c/4c609922a3ae0248597785d1f9adc8f142a80aef Pull UBI/UBIFS updates ]
[https://git.kernel.org/torvalds/c/f29135b54bcbfe1fea97d94e2ae860bade1d5a31 Pull btrfs updates ]
[https://git.kernel.org/torvalds/c/d09ba13110e303d7baa29d170da94cd24f7662b2 Pull libnvdimm updates ]
[https://git.kernel.org/torvalds/c/56e520c7a0a490b63b042b047ec9659fc08762a4 Pull IOMMU updates ]
[https://git.kernel.org/torvalds/c/de34f4da7f62ff59ac6e1ef320b0fcfa3296fce3 Pull media updates ]
[https://git.kernel.org/torvalds/c/a379f71a30dddbd2e7393624e455ce53c87965d1 Merge more updates ]
[https://git.kernel.org/torvalds/c/6b25e21fa6f26d0f0d45f161d169029411c84286 Pull drm updates ]
[https://git.kernel.org/torvalds/c/4cdf8dbe2d4b3891a9abd9f9ec32acbe58de0cf6 Pull uaccess.h prepwork ]
[https://git.kernel.org/torvalds/c/1573d2caf713874cfe0d1336c823d0fb548d8bed Pull parisc fixes ]
[https://git.kernel.org/torvalds/c/084165a3f8c8a88c83bdfa3941f897ae0f020211 Pull fbdev updates ]
[https://git.kernel.org/torvalds/c/2d2474a194652f55c7af51068db3c1b851f16711 Pull thermal managament updates ]
[https://git.kernel.org/torvalds/c/b67be92feb486f800d80d72c67fd87b47b79b18e Pull pwm updates ]
[https://git.kernel.org/torvalds/c/e3799a210d794fda0fa2ae99841d30cadf76069c Pull watchdog updates ]
[https://git.kernel.org/torvalds/c/44dc8c9d685a2b7c9d4f5a87c746799c80aa53f0 Pull x86 platform drivers updates ]
[https://git.kernel.org/torvalds/c/40bd3a5f341b4ef4c6a49fb68938247d3065d8ad PCI changes for the v4.9 merge window:]
[https://git.kernel.org/torvalds/c/35a891be96f1f8e1227e6ad3ca827b8a08ce47ea < XFS has gained super CoW powers! >]
[https://git.kernel.org/torvalds/c/2778556474b1996aa68ae61619386b8802733bd8 Pull nfsd updates ]
[https://git.kernel.org/torvalds/c/c4a86165d1ec70c8e592fa7b7cc7070971533021 Pull NFS client updates ]
[https://git.kernel.org/torvalds/c/29fbff8698fc0ac1a1d74584b258e0bf18b469f9 Pull networking fixes ]
[https://git.kernel.org/torvalds/c/d8bfb96a2e3c42f91a9944a19638c043cb86dd8f Pull more powerpc updates ]
[https://git.kernel.org/torvalds/c/e9f8f48bcac6f6dd37ad89ad63d1d1a497332313 Pull metag architecture fix ]
[https://git.kernel.org/torvalds/c/b56061b04e0264f3b24f7450a3d5790437bb912a Pull more SCSI updates ]
[https://git.kernel.org/torvalds/c/f96ed2612260a8a415512eed4fe3f5c77247d4a1 Pull libata updates ]
[https://git.kernel.org/torvalds/c/b6daa51b9a6a02a644dcf6b880fd50c1f70ec07f Pull percpu updates ]
[https://git.kernel.org/torvalds/c/f34d3606f76a8121b9d4940d2dd436bebeb2f9d7 Pull cgroup updates ]
[https://git.kernel.org/torvalds/c/ef98988ba369da88bab8a4d457407e71bbe160fa Pull more power management updates ]
[https://git.kernel.org/torvalds/c/b41d037a1fd32d6535a2eef877b10f8deefeaf70 Pull more ACPI updates ]
[https://git.kernel.org/torvalds/c/e5050143d67c80a8705d6fcf5f9972663a0f082e Pull more i2c updates ]
[https://git.kernel.org/torvalds/c/8b70f716174d6a46787fcf72f8c569ef3efd9c27 Pull RTC updates ]
[https://git.kernel.org/torvalds/c/689f891c980949d3eb64f61651db53cb347e0a13 Pull some more input subsystem updates ]
[https://git.kernel.org/torvalds/c/b292fb80bb44726ac1055d443d951a3058fc8263 Pull more rdma updates ]
[https://git.kernel.org/torvalds/c/ac9ef8cd075a1efee13036908a99a4bd5f9d4b8c Pull rdma qedr RoCE driver ]
[https://git.kernel.org/torvalds/c/d4d24d2d0a7ea3b62efd7336bfc2344e29b36bc5 Pull one more documentation update ]
[https://git.kernel.org/torvalds/c/84d69848c97faab0c25aa2667b273404d2e2a64a Pull kbuild updates ]
[https://git.kernel.org/torvalds/c/50cff89837a43a7c62ac080de9742a298d6418b3 Pull misc kbuild changes ]
[https://git.kernel.org/torvalds/c/5d89d9f502f9c33ed0270d716f238429861e1942 Pull kselftest updates ]
[https://git.kernel.org/torvalds/c/1a892b485f328224b4882818f84fcc0a3208677d Pull overlayfs updates ]
[https://git.kernel.org/torvalds/c/d3304cadb2e24517938e24efd58fd9ee6504fefe Pull btrfs fixes ]
[https://git.kernel.org/torvalds/c/87dbe42a16b654e33665756c63e96c0fa73eb003 Pull cifs fixes ]
[https://git.kernel.org/torvalds/c/b26b5ef5ec7eab0e1d84c5b281e87b2f2a5e0586 Pull more misc uaccess and vfs updates ]
[https://git.kernel.org/torvalds/c/050aaeab99067b6a08b34274ff15ca5dbb94a160 Pull sound fixes ]
[https://git.kernel.org/torvalds/c/133d970e0dadf7b413db19893acc5b26664bf4a1 Pull MIPS updates ]
[https://git.kernel.org/torvalds/c/9ffc66941df278c9f4df979b6bcf6c6ddafedd16 Pull gcc plugins update ]
[https://git.kernel.org/torvalds/c/df34d04a6f09ba41037e58c3df6d6fbed0ffcde9 Pull befs fixes ]