# git rev-parse -q --verify a2ccce2ddfec3972eb628de6aafe4910770ccb21^{commit}
a2ccce2ddfec3972eb628de6aafe4910770ccb21
already have revision, skipping fetch
# git checkout -q -f -B kisskb a2ccce2ddfec3972eb628de6aafe4910770ccb21
# git clean -qxdf
# < git log -1
# commit a2ccce2ddfec3972eb628de6aafe4910770ccb21
# Author: Paul Mackerras <paulus@ozlabs.org>
# Date:   Fri Aug 3 20:13:06 2018 +1000
# 
#     powerpc/64: Copy as much as possible in __copy_tofrom_user
#     
#     In __copy_tofrom_user, if we encounter an exception on a store, we
#     stop copying and return the number of bytes not copied.  However,
#     if the store is wider than one byte and is to an unaligned address,
#     it is possible that the store operand overlaps a page boundary
#     and the exception occurred on the latter part of the store operand,
#     meaning that it would be possible to copy a few more bytes.  Since
#     copy_to_user is generally expected to copy as much as possible,
#     it would be better to copy those extra few bytes.  This adds code
#     to do that.  Since this edge case is not performance-critical,
#     the code has been written to be compact rather than as fast as
#     possible.
#     
#     Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < git log --format=%s --max-count=1 a2ccce2ddfec3972eb628de6aafe4910770ccb21
# < make -s -j 40 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 40 ARCH=arm64 O=/kisskb/build/powerpc-next_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
<stdin>:1335:2: warning: #warning syscall rseq not implemented [-Wcpp]
Completed OK
# rm -rf /kisskb/build/powerpc-next_arm64-defconfig_arm64
# Build took: 0:01:47.243220