# git rev-parse -q --verify a602285ac11b019e9ce7c3907328e9f95f4967f0^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify a602285ac11b019e9ce7c3907328e9f95f4967f0^{commit}
a602285ac11b019e9ce7c3907328e9f95f4967f0
# git checkout -q -f -B kisskb a602285ac11b019e9ce7c3907328e9f95f4967f0
# git clean -qxdf
# < git log -1
# commit a602285ac11b019e9ce7c3907328e9f95f4967f0
# Merge: 5c4e0a21fae8 3f66f86bfed3
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Wed Nov 3 12:15:29 2021 -0700
# 
#     Merge branch 'per_signal_struct_coredumps-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
#     
#     Pull per signal_struct coredumps from Eric Biederman:
#      "Current coredumps are mixed up with the exit code, the signal handling
#       code, and the ptrace code making coredumps much more complicated than
#       necessary and difficult to follow.
#     
#       This series of changes starts with ptrace_stop and cleans it up,
#       making it easier to follow what is happening in ptrace_stop. Then
#       cleans up the exec interactions with coredumps. Then cleans up the
#       coredump interactions with exit. Finally the coredump interactions
#       with the signal handling code is cleaned up.
#     
#       The first and last changes are bug fixes for minor bugs.
#     
#       I believe the fact that vfork followed by execve can kill the process
#       the called vfork if exec fails is sufficient justification to change
#       the userspace visible behavior.
#     
#       In previous discussions some of these changes were organized
#       differently and individually appeared to make the code base worse. As
#       currently written I believe they all stand on their own as cleanups
#       and bug fixes.
#     
#       Which means that even if the worst should happen and the last change
#       needs to be reverted for some unimaginable reason, the code base will
#       still be improved.
#     
#       If the worst does not happen there are a more cleanups that can be
#       made. Signals that generate coredumps can easily become eligible for
#       short circuit delivery in complete_signal. The entire rendezvous for
#       generating a coredump can move into get_signal. The function
#       force_sig_info_to_task be written in a way that does not modify the
#       signal handling state of the target task (because coredumps are
#       eligible for short circuit delivery). Many of these future cleanups
#       can be done another way but nothing so cleanly as if coredumps become
#       per signal_struct"
#     
#     * 'per_signal_struct_coredumps-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
#       coredump: Limit coredumps to a single thread group
#       coredump:  Don't perform any cleanups before dumping core
#       exit: Factor coredump_exit_mm out of exit_mm
#       exec: Check for a pending fatal signal instead of core_state
#       ptrace: Remove the unnecessary arguments from arch_ptrace_stop
#       signal: Remove the bogus sigkill_pending in ptrace_stop
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 a602285ac11b019e9ce7c3907328e9f95f4967f0
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus-rand_powerpc-randconfig_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  randconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_CPU_BIG_ENDIAN=y
# Added to kconfig CONFIG_PPC64=y
# Added to kconfig CONFIG_PPC_DISABLE_WERROR=y
# Added to kconfig CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_LD_HEAD_STUB_CATCH=y
# Added to kconfig CONFIG_TRIM_UNUSED_KSYMS=n
# Added to kconfig CONFIG_UBSAN=n
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus-rand_powerpc-randconfig_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 48 ARCH=powerpc O=/kisskb/build/linus-rand_powerpc-randconfig_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:4747:warning: override: reassigning to symbol PPC64
.config:4748:warning: override: reassigning to symbol PPC_DISABLE_WERROR
.config:4750:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
.config:4752:warning: override: reassigning to symbol GCC_PLUGINS
# make -s -j 48 ARCH=powerpc O=/kisskb/build/linus-rand_powerpc-randconfig_powerpc-gcc9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-9.2.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/linus-rand_powerpc-randconfig_powerpc-gcc9
# Build took: 0:06:36.331312