# git rev-parse -q --verify 40e020c129cfc991e8ab4736d2665351ffd1468d^{commit}
40e020c129cfc991e8ab4736d2665351ffd1468d
already have revision, skipping fetch
# git checkout -q -f -B kisskb 40e020c129cfc991e8ab4736d2665351ffd1468d
# git clean -qxdf
# < git log -1
# commit 40e020c129cfc991e8ab4736d2665351ffd1468d
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Dec 9 15:31:00 2018 -0800
# 
#     Linux 4.20-rc6
# < /opt/cross/kisskb/br-xtensa-full-2016.08-613-ge98b4dd/bin/xtensa-linux-gcc --version
# < git log --format=%s --max-count=1 40e020c129cfc991e8ab4736d2665351ffd1468d
# < make -s -j 8 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 8 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>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
<stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/linus_xtensa-allnoconfig_xtensa
# Build took: 0:00:21.204390