# git rev-parse -q --verify 55db91fbaad9ea769d516e6867195808b4399894^{commit}
55db91fbaad9ea769d516e6867195808b4399894
already have revision, skipping fetch
# git checkout -q -f -B kisskb 55db91fbaad9ea769d516e6867195808b4399894
# git clean -qxdf
# < git log -1
# commit 55db91fbaad9ea769d516e6867195808b4399894
# Merge: 9ef10340749e 6ab7d47bcbf0
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Dec 29 10:13:23 2018 -0800
# 
#     Merge branch 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
#     
#     Pull percpu update from Dennis Zhou:
#      "Michael Cree noted generic UP Alpha has been broken since v3.18. This
#       is a small fix for locking in UP percpu code that fixes the issue"
#     
#     * 'for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
#       percpu: convert spin_lock_irq to spin_lock_irqsave.
# < /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 55db91fbaad9ea769d516e6867195808b4399894
# < make -s -j 48 ARCH=xtensa O=/kisskb/build/linus_xtensa-allnoconfig_xtensa CROSS_COMPILE=/opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-  allnoconfig
drivers/staging/mt7621-dts/Kconfig:4:warning: 'BUILTIN_DTB' has wrong type. 'select' only accept arguments of bool and tristate type
# make -s -j 48 ARCH=xtensa O=/kisskb/build/linus_xtensa-allnoconfig_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-allnoconfig_xtensa
# Build took: 0:00:13.075654