# git rev-parse -q --verify 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5^{commit}
9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
already have revision, skipping fetch
# git checkout -q -f -B kisskb 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
# git clean -qxdf
# < git log -1
# commit 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Aug 16 13:04:57 2020 -0700
# 
#     Linux 5.9-rc1
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-ld --version
# < git log --format=%s --max-count=1 9123e3a74ec7b934a4a099e98af6a61c2f80bbf5
# < make -s -j 8 ARCH=arm O=/kisskb/build/linus_bcm2835_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  bcm2835_defconfig
# < make -s -j 8 ARCH=arm O=/kisskb/build/linus_bcm2835_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  help
# make -s -j 8 ARCH=arm O=/kisskb/build/linus_bcm2835_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  olddefconfig
# make -s -j 8 ARCH=arm O=/kisskb/build/linus_bcm2835_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  
In file included from /kisskb/src/kernel/rcu/update.c:591:0:
/kisskb/src/kernel/rcu/tasks.h:593:13: warning: 'show_rcu_tasks_classic_gp_kthread' defined but not used [-Wunused-function]
 static void show_rcu_tasks_classic_gp_kthread(void) { }
             ^
Completed OK
# rm -rf /kisskb/build/linus_bcm2835_defconfig_arm-gcc4.9
# Build took: 0:02:35.284160