# 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/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 5076190daded2197f62fe92cf69674488be44175
# < make -s -j 24 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  allmodconfig
# < make -s -j 24 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  help
# make -s -j 24 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  olddefconfig
# make -s -j 24 ARCH=arm64 O=/kisskb/build/linus_arm64-allmodconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:35: LSE atomics not supported by binutils
In file included from /kisskb/src/include/linux/rwsem.h:16:0,
                 from /kisskb/src/include/linux/notifier.h:15,
                 from /kisskb/src/include/linux/clk.h:14,
                 from /kisskb/src/drivers/tty/serial/sh-sci.c:20:
/kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/tty/serial/sh-sci.c:1348:16: note: 'flags' was declared here
  unsigned long flags;
                ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr':
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized]
   pd->msg->buf[real_pos] = data;
                          ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here
  unsigned char data;
                ^
In file included from /kisskb/src/include/linux/wait.h:9:0,
                 from /kisskb/src/include/linux/net.h:19,
                 from /kisskb/src/drivers/infiniband/sw/siw/siw_qp_rx.c:8:
/kisskb/src/drivers/infiniband/sw/siw/siw_qp_rx.c: In function 'siw_proc_send':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/infiniband/sw/siw/siw_qp_rx.c:335:16: note: 'flags' was declared here
  unsigned long flags;
                ^
Completed OK
# rm -rf /kisskb/build/linus_arm64-allmodconfig_arm64-gcc5.4
# Build took: 0:24:08.520637