# git gc
# git rev-parse -q --verify 870d16757ba8918c3f8cac162b9ca7669556dbab^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify 870d16757ba8918c3f8cac162b9ca7669556dbab^{commit}
870d16757ba8918c3f8cac162b9ca7669556dbab
# git checkout -q -f -B kisskb 870d16757ba8918c3f8cac162b9ca7669556dbab
# git clean -qxdf
# < git log -1
# commit 870d16757ba8918c3f8cac162b9ca7669556dbab
# Author: Mark Rutland <mark.rutland@arm.com>
# Date:   Wed Dec 16 21:32:48 2020 +0000
# 
#     arm64: make _TIF_WORK_MASK bits contiguous
#     
#     We need the bits of _TIF_WORK_MASK to be contiguous in order to to use
#     this as an immediate argument to an AND instruction in entry.S.
#     
#     We happened to change these bits in commits:
#     
#       b5a5a01d8e9a ("arm64: uaccess: remove addr_limit_user_check()")
#       192caabd4dd9 ("arm64: add support for TIF_NOTIFY_SIGNAL")
#     
#     which each worked in isolation, but the merge resolution in commit:
#     
#       005b2a9dc819 ("Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block")
#     
#     happened to make the bits non-contiguous.
#     
#     Fix this by moving TIF_NOTIFY_SIGNAL to be bit 6, which is contiguous
#     with the rest of _TIF_WORK_MASK.
#     
#     Otherwise, we'll get a build-time failure as below:
#     
#        arch/arm64/kernel/entry.S: Assembler messages:
#        arch/arm64/kernel/entry.S:733: Error: immediate out of range at operand 3 -- `and x2,x19,#((1<<1)|(1<<0)|(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<7))'
#        scripts/Makefile.build:360: recipe for target 'arch/arm64/kernel/entry.o' failed
#     
#     Fixes: 005b2a9dc819a126 ("Merge tag 'tif-task_work.arch-2020-12-14' of git://git.kernel.dk/linux-block")
#     Signed-off-by: Mark Rutland <mark.rutland@arm.com>
#     Cc: Catalin Marinas <catalin.marinas@arm.com>
#     Cc: Will Deacon <will@kernel.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /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 870d16757ba8918c3f8cac162b9ca7669556dbab
# < make -s -j 24 ARCH=arm O=/kisskb/build/linus_magician_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  magician_defconfig
# < make -s -j 24 ARCH=arm O=/kisskb/build/linus_magician_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 24 ARCH=arm O=/kisskb/build/linus_magician_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 24 ARCH=arm O=/kisskb/build/linus_magician_defconfig_arm-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-  
Completed OK
# rm -rf /kisskb/build/linus_magician_defconfig_arm-gcc4.9
# Build took: 0:05:47.311290