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Filename Latest commit message Latest commit date
Carlos Llamas da97a10882 ANDROID: binder: fix race in priority restore 
During a reply, the target gets woken up and then the priority of the
replier is restored. The order is such to allow the target to process
the reply ASAP. Otherwise, we risk the sender getting scheduled out
before the wakeup happens. This strategy reduces transaction latency.

However, a subsequent transaction from the same target could be started
before the priority of the replier gets restored. At this point we save
the wrong priority and it gets reinstated at the end of the transaction.

This patch allows the incoming transaction to detect the race condition
and save the correct next priority. Additionally, the replier will abort
its pending priority restore which allows the new transaction to always
run at the desired priority.

Bug: 148101660
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Change-Id: I6fec41ae1a1342023f78212ab1f984e26f068221
(cherry picked from commit cac827f2619b280d418e546a09f25da600dafe5a)
[cmllamas: fixed trivial merge conflict]
2022-08-03 16:21:47 +00:00
android Merge tag 'android11-5.4.197_r00' into 'android11-5.4' 2022-07-27 11:19:48 +02:00
arch Merge tag 'android11-5.4.197_r00' into 'android11-5.4' 2022-07-27 11:19:48 +02:00
block This is the 5.4.196 stable release 2022-05-25 10:40:14 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
Documentation This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
drivers ANDROID: binder: fix race in priority restore 2022-08-03 16:21:47 +00:00
fs This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
include BACKPORT: Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put 2022-08-03 13:09:03 +01:00
init This is the 5.4.189 stable release 2022-04-19 16:29:31 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
lib This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
LICENSES
mm Merge tag 'android11-5.4.197_r00' into 'android11-5.4' 2022-07-27 11:19:48 +02:00
net BACKPORT: Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put 2022-08-03 13:09:03 +01:00
samples This is the 5.4.160 stable release 2021-11-17 10:19:21 +01:00
scripts This is the 5.4.190 stable release 2022-04-21 14:13:50 +02:00
security This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
sound Merge tag 'android11-5.4.197_r00' into 'android11-5.4' 2022-07-27 11:19:48 +02:00
tools This is the 5.4.196 stable release 2022-05-25 10:40:14 +02:00
usr
virt KVM: Prevent module exit until all VMs are freed 2022-04-15 14:18:27 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
build.config.aarch64 ANDROID: distribute Module.symvers 2021-10-14 13:14:46 +08:00
build.config.allmodconfig ANDROID: Different fix for KABI breakage in 5.4.151 in struct sock 2021-10-12 18:21:21 +02:00
build.config.allmodconfig.aarch64
build.config.allmodconfig.arm
build.config.allmodconfig.x86_64
build.config.arm
build.config.common ANDROID: fix KCFLAGS override by __ANDROID_COMMON_KERNEL__ 2022-04-29 17:53:05 +00:00
build.config.db845c
build.config.gki
build.config.gki-debug.aarch64
build.config.gki-debug.x86_64
build.config.gki.aarch64 ANDROID: GKI: Add symbol list for Zebra 2022-03-23 15:27:27 +00:00
build.config.gki.x86_64
build.config.gki_kasan
build.config.gki_kasan.aarch64
build.config.gki_kasan.x86_64
build.config.gki_kprobes
build.config.gki_kprobes.aarch64
build.config.gki_kprobes.x86_64
build.config.hikey960
build.config.x86_64 ANDROID: distribute Module.symvers 2021-10-14 13:14:46 +08:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile This is the 5.4.197 stable release 2022-06-06 11:06:30 +02:00
OWNERS
README
README.md

README.md

How do I submit patches to Android Common Kernels

  1. BEST: Make all of your changes to upstream Linux. If appropriate, backport to the stable releases. These patches will be merged automatically in the corresponding common kernels. If the patch is already in upstream Linux, post a backport of the patch that conforms to the patch requirements below.

  2. LESS GOOD: Develop your patches out-of-tree (from an upstream Linux point-of-view). Unless these are fixing an Android-specific bug, these are very unlikely to be accepted unless they have been coordinated with kernel-team@android.com. If you want to proceed, post a patch that conforms to the patch requirements below.

Common Kernel patch requirements

  • All patches must conform to the Linux kernel coding standards and pass script/checkpatch.pl
  • Patches shall not break gki_defconfig or allmodconfig builds for arm, arm64, x86, x86_64 architectures (see https://source.android.com/setup/build/building-kernels)
  • If the patch is not merged from an upstream branch, the subject must be tagged with the type of patch: UPSTREAM:, BACKPORT:, FROMGIT:, FROMLIST:, or ANDROID:.
  • All patches must have a Change-Id: tag (see https://gerrit-review.googlesource.com/Documentation/user-changeid.html)
  • If an Android bug has been assigned, there must be a Bug: tag.
  • All patches must have a Signed-off-by: tag by the author and the submitter

Additional requirements are listed below based on patch type

Requirements for backports from mainline Linux: UPSTREAM:, BACKPORT:

  • If the patch is a cherry-pick from Linux mainline with no changes at all
    • tag the patch subject with UPSTREAM:.
    • add upstream commit information with a (cherry-picked from ...) line
    • Example:
      • if the upstream commit message is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        UPSTREAM: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch requires any changes from the upstream version, tag the patch with BACKPORT: instead of UPSTREAM:.
    • use the same tags as UPSTREAM:
    • add comments about the changes under the (cherry-picked from ...) line
    • Example:
        BACKPORT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        [ Resolved minor conflict in drivers/foo/bar.c ]
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for other backports: FROMGIT:, FROMLIST:,

  • If the patch has been merged into an upstream maintainer tree, but has not yet been merged into Linux mainline
    • tag the patch subject with FROMGIT:
    • add info on where the patch came from as (cherry picked from commit <sha1> <repo> <branch>). This must be a stable maintainer branch (not rebased, so don't use linux-next for example).
    • if changes were required, use BACKPORT: FROMGIT:
    • Example:
      • if the commit message in the maintainer tree is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        FROMGIT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        (cherry picked from commit 878a2fd9de10b03d11d2f622250285c7e63deace
         https://git.kernel.org/pub/scm/linux/kernel/git/foo/bar.git test-branch)
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch has been submitted to LKML, but not accepted into any maintainer tree
    • tag the patch subject with FROMLIST:
    • add a Link: tag with a link to the submittal on lore.kernel.org
    • if changes were required, use BACKPORT: FROMLIST:
    • Example:
        FROMLIST: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Link: https://lore.kernel.org/lkml/20190619171517.GA17557@someone.com/
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for Android-specific patches: ANDROID:

  • If the patch is fixing a bug to Android-specific code
    • tag the patch subject with ANDROID:
    • add a Fixes: tag that cites the patch with the bug
    • Example:
        ANDROID: fix android-specific bug in foobar.c

        This is the detailed description of the important fix

        Fixes: 1234abcd2468 ("foobar: add cool feature")
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch is a new feature
    • tag the patch subject with ANDROID:
    • add a Bug: tag with the Android bug (required for android-specific features)