# git rev-parse -q --verify b5641a5d8b8b14643bfe3d017d64da90a5c55479^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify b5641a5d8b8b14643bfe3d017d64da90a5c55479^{commit}
b5641a5d8b8b14643bfe3d017d64da90a5c55479
# git checkout -q -f -B kisskb b5641a5d8b8b14643bfe3d017d64da90a5c55479
# git clean -qxdf
# < git log -1
# commit b5641a5d8b8b14643bfe3d017d64da90a5c55479
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Jul 3 19:29:48 2023 -0700
# 
#     mm: don't do validate_mm() unnecessarily and without mmap locking
#     
#     This is an addition to commit ae80b4041984 ("mm: validate the mm before
#     dropping the mmap lock"), because it turns out there were two problems,
#     but lockdep just stopped complaining after finding the first one.
#     
#     The do_vmi_align_munmap() function now drops the mmap lock after doing
#     the validate_mm() call, but it turns out that one of the callers then
#     immediately calls validate_mm() again.
#     
#     That's both a bit silly, and now (again) happens without the mmap lock
#     held.
#     
#     So just remove that validate_mm() call from the caller, but make sure to
#     not lose any coverage by doing that mm sanity checking in the error path
#     of do_vmi_align_munmap() too.
#     
#     Reported-and-tested-by: kernel test robot <oliver.sang@intel.com>
#     Link: https://lore.kernel.org/lkml/ZKN6CdkKyxBShPHi@xsang-OptiPlex-9020/
#     Fixes: 408579cd627a ("mm: Update do_vmi_align_munmap() return semantics")
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 b5641a5d8b8b14643bfe3d017d64da90a5c55479
# make -s -j 24 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 24 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 24 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 24 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_x86_64_defconfig_x86_64-gcc8
# Build took: 0:04:15.242275