# git rev-parse -q --verify 021533194476035883300d60fbb3136426ac8ea5^{commit}
021533194476035883300d60fbb3136426ac8ea5
already have revision, skipping fetch
# git checkout -q -f -B kisskb 021533194476035883300d60fbb3136426ac8ea5
# git clean -qxdf
# < git log -1
# commit 021533194476035883300d60fbb3136426ac8ea5
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Feb 1 14:57:17 2024 -0800
# 
#     Kconfig: Disable -Wstringop-overflow for GCC globally
#     
#     It turns out it was never just gcc-11 that was broken.  Apparently it
#     just happens to work on x86-64 with other gcc versions.
#     
#     On arm64, I see warnings with gcc version 13.2.1, and the kernel test
#     robot reports the same problem on s390 with gcc 13.2.0.
#     
#     Admittedly it seems to be just the new Xe drm driver, but this is
#     keeping me from doing my normal arm64 build testing.  So it gets
#     reverted until somebody figures out what causes the problem (and why it
#     doesn't show on x86-64, which is what makes me suspect it was never just
#     about gcc-11, and more about just random happenstance).
#     
#     This also changes the Kconfig naming a bit - just make the "disable this
#     for GCC" conditional be one simple Kconfig entry, and we can put the gcc
#     version dependencies in that entry once we figure out what the correct
#     rules are.
#     
#     The version dependency _may_ still end up being "gcc version larger than
#     11" if the issue is purely in the Xe driver, but even if that ends up
#     the case, let's make that all part of the "GCC_NO_STRINGOP_OVERFLOW"
#     logic.
#     
#     For now, we just disable it for all gcc versions while the exact cause
#     is unknown.
#     
#     Link: https://lore.kernel.org/all/202401161031.hjGJHMiJ-lkp@intel.com/T/
#     Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
#     Cc: Kees Cook <keescook@chromium.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 021533194476035883300d60fbb3136426ac8ea5
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_skiroot_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  skiroot_defconfig
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_skiroot_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_skiroot_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 40 ARCH=powerpc O=/kisskb/build/linus_skiroot_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/fs/btrfs/extent_io.c: In function 'extent_fiemap':
/kisskb/src/fs/btrfs/extent_io.c:3061:19: warning: 'last_extent_end' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (cache.cached && cache.offset + cache.len >= last_extent_end) {
                   ^
/kisskb/src/fs/btrfs/extent_io.c: At top level:
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-shift-negative-value'
cc1: warning: unrecognized command line option '-Wno-stringop-overflow'
Completed OK
# rm -rf /kisskb/build/linus_skiroot_defconfig_powerpc-gcc5
# Build took: 0:01:02.489157