# git rev-parse -q --verify fe76fc6aaf538df27708ffa3e5d549a6c8e16142^{commit}
fe76fc6aaf538df27708ffa3e5d549a6c8e16142
already have revision, skipping fetch
# git checkout -q -f -B kisskb fe76fc6aaf538df27708ffa3e5d549a6c8e16142
# git clean -qxdf
# < git log -1
# commit fe76fc6aaf538df27708ffa3e5d549a6c8e16142
# Author: Ming Lei <ming.lei@redhat.com>
# Date:   Tue Jan 15 11:59:52 2019 +0800
# 
#     sbitmap: Protect swap_lock from hardirq
#     
#     Because we may call blk_mq_get_driver_tag() directly from
#     blk_mq_dispatch_rq_list() without holding any lock, then HARDIRQ may
#     come and the above DEADLOCK is triggered.
#     
#     Commit ab53dcfb3e7b ("sbitmap: Protect swap_lock from hardirq") tries to
#     fix this issue by using 'spin_lock_bh', which isn't enough because we
#     complete request from hardirq context direclty in case of multiqueue.
#     
#     Cc: Clark Williams <williams@redhat.com>
#     Fixes: ab53dcfb3e7b ("sbitmap: Protect swap_lock from hardirq")
#     Cc: Jens Axboe <axboe@kernel.dk>
#     Cc: Ming Lei <ming.lei@redhat.com>
#     Cc: Guenter Roeck <linux@roeck-us.net>
#     Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
#     Signed-off-by: Ming Lei <ming.lei@redhat.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-gcc --version
# < /opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-ld --version
# < git log --format=%s --max-count=1 fe76fc6aaf538df27708ffa3e5d549a6c8e16142
# < make -s -j 10 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  defconfig
drivers/staging/mt7621-dts/Kconfig:4:warning: 'BUILTIN_DTB' has wrong type. 'select' only accept arguments of bool and tristate type
# make -s -j 10 ARCH=xtensa O=/kisskb/build/linus_xtensa-defconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  
<stdin>:1333:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
<stdin>:1336:2: warning: #warning syscall rseq not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/linus_xtensa-defconfig_xtensa
# Build took: 0:00:48.833912