# git rev-parse -q --verify 5450e8a316a64cddcbc15f90733ebc78aa736545^{commit}
5450e8a316a64cddcbc15f90733ebc78aa736545
already have revision, skipping fetch
# git checkout -q -f -B kisskb 5450e8a316a64cddcbc15f90733ebc78aa736545
# git clean -qxdf
# < git log -1
# commit 5450e8a316a64cddcbc15f90733ebc78aa736545
# Merge: 29cd581b5949 172bb24a4f48
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Wed Jul 10 22:17:21 2019 -0700
# 
#     Merge tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
#     
#     Pull pidfd updates from Christian Brauner:
#      "This adds two main features.
#     
#        - First, it adds polling support for pidfds. This allows process
#          managers to know when a (non-parent) process dies in a race-free
#          way.
#     
#          The notification mechanism used follows the same logic that is
#          currently used when the parent of a task is notified of a child's
#          death. With this patchset it is possible to put pidfds in an
#          {e}poll loop and get reliable notifications for process (i.e.
#          thread-group) exit.
#     
#        - The second feature compliments the first one by making it possible
#          to retrieve pollable pidfds for processes that were not created
#          using CLONE_PIDFD.
#     
#          A lot of processes get created with traditional PID-based calls
#          such as fork() or clone() (without CLONE_PIDFD). For these
#          processes a caller can currently not create a pollable pidfd. This
#          is a problem for Android's low memory killer (LMK) and service
#          managers such as systemd.
#     
#       Both patchsets are accompanied by selftests.
#     
#       It's perhaps worth noting that the work done so far and the work done
#       in this branch for pidfd_open() and polling support do already see
#       some adoption:
#     
#        - Android is in the process of backporting this work to all their LTS
#          kernels [1]
#     
#        - Service managers make use of pidfd_send_signal but will need to
#          wait until we enable waiting on pidfds for full adoption.
#     
#        - And projects I maintain make use of both pidfd_send_signal and
#          CLONE_PIDFD [2] and will use polling support and pidfd_open() too"
#     
#     [1] https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.9+backport%22
#         https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.14+backport%22
#         https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.19+backport%22
#     
#     [2] https://github.com/lxc/lxc/blob/aab6e3eb73c343231cdde775db938994fc6f2803/src/lxc/start.c#L1753
#     
#     * tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
#       tests: add pidfd_open() tests
#       arch: wire-up pidfd_open()
#       pid: add pidfd_open()
#       pidfd: add polling selftests
#       pidfd: add polling support
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 5450e8a316a64cddcbc15f90733ebc78aa736545
# < make -s -j 48 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 defconfig
# make -s -j 48 ARCH=um O=/kisskb/build/linus_um-defconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
/kisskb/src/arch/um/os-Linux/signal.c: In function 'timer_real_alarm_handler':
/kisskb/src/arch/um/os-Linux/signal.c:93:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
/kisskb/src/arch/um/os-Linux/signal.c: In function 'sig_handler_common':
/kisskb/src/arch/um/os-Linux/signal.c:51:1: warning: the frame size of 2960 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
  LINK linux
Completed OK
# rm -rf /kisskb/build/linus_um-defconfig_um-x86_64
# Build took: 0:00:36.983067