# git rev-parse -q --verify cca19f0b684f4ed6aabf6ad07ae3e15e77bfd78a^{commit}
cca19f0b684f4ed6aabf6ad07ae3e15e77bfd78a
already have revision, skipping fetch
# git checkout -q -f -B kisskb cca19f0b684f4ed6aabf6ad07ae3e15e77bfd78a
# git clean -qxdf
# < git log -1
# commit cca19f0b684f4ed6aabf6ad07ae3e15e77bfd78a
# Author: Frederic Barrat <fbarrat@linux.ibm.com>
# Date:   Tue Jul 31 15:24:52 2018 +0200
# 
#     powerpc/64s/radix: Fix missing global invalidations when removing copro
#     
#     With the optimizations for TLB invalidation from commit 0cef77c7798a
#     ("powerpc/64s/radix: flush remote CPUs out of single-threaded
#     mm_cpumask"), the scope of a TLBI (global vs. local) can now be
#     influenced by the value of the 'copros' counter of the memory context.
#     
#     When calling mm_context_remove_copro(), the 'copros' counter is
#     decremented first before flushing. It may have the unintended side
#     effect of sending local TLBIs when we explicitly need global
#     invalidations in this case. Thus breaking any nMMU user in a bad and
#     unpredictable way.
#     
#     Fix it by flushing first, before updating the 'copros' counter, so
#     that invalidations will be global.
#     
#     Fixes: 0cef77c7798a ("powerpc/64s/radix: flush remote CPUs out of single-threaded mm_cpumask")
#     Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
#     Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
#     Tested-by: Vaibhav Jain <vaibhav@linux.ibm.com>
#     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 cca19f0b684f4ed6aabf6ad07ae3e15e77bfd78a
# < make -s -j 120 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 120 ARCH=arm64 O=/kisskb/build/powerpc-fixes_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-fixes_arm64-defconfig_arm64
# Build took: 0:01:30.058146