# git rev-parse -q --verify 7312bd0c205dc9e6e30128ef9243d7bc8ba1187d^{commit}
7312bd0c205dc9e6e30128ef9243d7bc8ba1187d
already have revision, skipping fetch
# git checkout -q -f -B kisskb 7312bd0c205dc9e6e30128ef9243d7bc8ba1187d
# git clean -qxdf
# < git log -1
# commit 7312bd0c205dc9e6e30128ef9243d7bc8ba1187d
# Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
# Date:   Thu Aug 23 10:26:08 2018 +0530
# 
#     powerpc/mce: Fix SLB rebolting during MCE recovery path.
#     
#     With the powerpc next commit e7e81847478b ("powerpc/64s: move machine
#     check SLB flushing to mm/slb.c"), the SLB error recovery is broken.
#     The new code now does not add the index value to RB[52-63] that
#     selects the SLB entry when rebolting, instead it assumes that the
#     shadow save area already has the index embeded correctly in the esid
#     field.
#     
#     While all valid bolted save areas do contain index value set
#     correctly, there is a case where 3rd (KSTACK_INDEX) entry for kernel
#     stack does not embed index for NULL esid entry. This patch fixes that.
#     
#     Without this patch the SLB rebolt code overwirtes the 1st entry of
#     kernel linear mapping and causes SLB recovery to fail.
#     
#     Fixes: e7e81847478b ("powerpc/64s: move machine check SLB flushing to mm/slb.c")
#     Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Reviewed-by: Nicholas Piggin <npiggin@gmail.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 7312bd0c205dc9e6e30128ef9243d7bc8ba1187d
# < make -s -j 48 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 48 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: 0:03:24.123370