# git rev-parse -q --verify 87066fdd2e30fe9dd531125d95257c118a74617e^{commit}
87066fdd2e30fe9dd531125d95257c118a74617e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 87066fdd2e30fe9dd531125d95257c118a74617e
# git clean -qxdf
# < git log -1
# commit 87066fdd2e30fe9dd531125d95257c118a74617e
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Oct 24 09:48:33 2021 -1000
# 
#     Revert "mm/secretmem: use refcount_t instead of atomic_t"
#     
#     This reverts commit 110860541f443f950c1274f217a1a3e298670a33.
#     
#     Converting the "secretmem_users" counter to a refcount is incorrect,
#     because a refcount is special in zero and can't just be incremented (but
#     a count of users is not, and "no users" is actually perfectly valid and
#     not a sign of a free'd resource).
#     
#     Reported-by: syzbot+75639e6a0331cd61d3e2@syzkaller.appspotmail.com
#     Cc: Jordy Zomer <jordy@pwning.systems>
#     Cc: Kees Cook <keescook@chromium.org>,
#     Cc: Jordy Zomer <jordy@jordyzomer.github.io>
#     Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
#     Cc: Mike Rapoport <rppt@kernel.org>
#     Cc: Andrew Morton <akpm@linux-foundation.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 87066fdd2e30fe9dd531125d95257c118a74617e
# < make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_x86_64_defconfig_x86_64-gcc11
# Build took: 0:01:41.084791