# git rev-parse -q --verify 5076190daded2197f62fe92cf69674488be44175^{commit}
5076190daded2197f62fe92cf69674488be44175
already have revision, skipping fetch
# git checkout -q -f -B kisskb 5076190daded2197f62fe92cf69674488be44175
# git clean -qxdf
# < git log -1
# commit 5076190daded2197f62fe92cf69674488be44175
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Mar 17 11:04:09 2020 -0700
# 
#     mm: slub: be more careful about the double cmpxchg of freelist
#     
#     This is just a cleanup addition to Jann's fix to properly update the
#     transaction ID for the slub slowpath in commit fd4d9c7d0c71 ("mm: slub:
#     add missing TID bump..").
#     
#     The transaction ID is what protects us against any concurrent accesses,
#     but we should really also make sure to make the 'freelist' comparison
#     itself always use the same freelist value that we then used as the new
#     next free pointer.
#     
#     Jann points out that if we do all of this carefully, we could skip the
#     transaction ID update for all the paths that only remove entries from
#     the lists, and only update the TID when adding entries (to avoid the ABA
#     issue with cmpxchg and list handling re-adding a previously seen value).
#     
#     But this patch just does the "make sure to cmpxchg the same value we
#     used" rather than then try to be clever.
#     
#     Acked-by: Jann Horn <jannh@google.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-ld --version
# < git log --format=%s --max-count=1 5076190daded2197f62fe92cf69674488be44175
# < make -s -j 48 ARCH=arm O=/kisskb/build/linus_viper_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  viper_defconfig
# < make -s -j 48 ARCH=arm O=/kisskb/build/linus_viper_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  help
# make -s -j 48 ARCH=arm O=/kisskb/build/linus_viper_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  olddefconfig
# make -s -j 48 ARCH=arm O=/kisskb/build/linus_viper_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  
Completed OK
# rm -rf /kisskb/build/linus_viper_defconfig_arm-gcc4.9
# Build took: 0:00:48.703466