# git rev-parse -q --verify 8550aa6c78553db799becfc53c7e7890602862d6^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-stable-rc.git linux-5.4.y
# git rev-parse -q --verify 8550aa6c78553db799becfc53c7e7890602862d6^{commit}
8550aa6c78553db799becfc53c7e7890602862d6
# git checkout -q -f -B kisskb 8550aa6c78553db799becfc53c7e7890602862d6
# git clean -qxdf
# < git log -1
# commit 8550aa6c78553db799becfc53c7e7890602862d6
# Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
# Date:   Thu Feb 27 14:22:22 2020 +0100
# 
#     Linux 5.4.23-rc1
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 8550aa6c78553db799becfc53c7e7890602862d6
# < make -s -j 160 ARCH=s390 O=/kisskb/build/stable-rc-5.4_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  defconfig
# < make -s -j 160 ARCH=s390 O=/kisskb/build/stable-rc-5.4_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 160 ARCH=s390 O=/kisskb/build/stable-rc-5.4_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  olddefconfig
# make -s -j 160 ARCH=s390 O=/kisskb/build/stable-rc-5.4_s390-defconfig_s390x-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/s390-linux/bin/s390-linux-  
In file included from /kisskb/src/include/linux/kernel.h:11:0,
                 from /kisskb/src/include/linux/list.h:9,
                 from /kisskb/src/include/linux/wait.h:7,
                 from /kisskb/src/include/linux/wait_bit.h:8,
                 from /kisskb/src/include/linux/fs.h:6,
                 from /kisskb/src/include/linux/highmem.h:5,
                 from /kisskb/src/include/linux/bio.h:8,
                 from /kisskb/src/drivers/md/bcache/bcache.h:182,
                 from /kisskb/src/drivers/md/bcache/super.c:10:
/kisskb/src/drivers/md/bcache/super.c: In function 'register_bcache':
/kisskb/src/include/linux/compiler.h:188:26: warning: 'sb_page' may be used uninitialized in this function [-Wmaybe-uninitialized]
  case 8: *(__u64 *)res = *(volatile __u64 *)p; break;  \
                          ^
/kisskb/src/drivers/md/bcache/super.c:2379:15: note: 'sb_page' was declared here
  struct page *sb_page;
               ^
Completed OK
# rm -rf /kisskb/build/stable-rc-5.4_s390-defconfig_s390x-gcc4.9
# Build took: 0:03:24.438611