# git rev-parse -q --verify 1ccd25030612c37a86f574e71c4f5b0ac246c183^{commit}
1ccd25030612c37a86f574e71c4f5b0ac246c183
already have revision, skipping fetch
# git checkout -q -f -B kisskb 1ccd25030612c37a86f574e71c4f5b0ac246c183
# git clean -qxdf
# < git log -1
# commit 1ccd25030612c37a86f574e71c4f5b0ac246c183
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Wed Aug 15 00:10:22 2018 +1000
# 
#     powerpc/64s/hash: convert SLB miss handlers to C
#     
#     This patch moves SLB miss handlers completely to C, using the standard
#     exception handler macros to set up the stack and branch to C.
#     
#     This can be done because the segment containing the kernel stack is
#     always bolted, so accessing it with relocation on will not cause an
#     SLB exception.
#     
#     Arbitrary kernel memory may not be accessed when handling kernel space
#     SLB misses, so care should be taken there. However user SLB misses can
#     access any kernel memory, which can be used to move some fields out of
#     the paca (in later patches).
#     
#     User SLB misses could quite easily reconcile IRQs and set up a first
#     class kernel environment and exit via ret_from_except, however that
#     doesn't seem to be necessary at the moment, so we only do that if a
#     bad fault is encountered.
#     
#     [ Credit to Aneesh for bug fixes, error checks, and improvements to bad
#       address handling, etc ]
#     
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     
#     Since RFC:
#     - Added MSR[RI] handling
#     - Fixed up a register loss bug exposed by irq tracing (Aneesh)
#     - Reject misses outside the defined kernel regions (Aneesh)
#     - Added several more sanity checks and error handling (Aneesh), we may
#       look at consolidating these tests and tightenig up the code but for
#       a first pass we decided it's better to check carefully.
#     
#     Since v1:
#     - Fixed SLB cache corruption (Aneesh)
#     - Fixed untidy SLBE allocation "leak" in get_vsid error case
#     - Now survives some stress testing on real hardware
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < git log --format=%s --max-count=1 1ccd25030612c37a86f574e71c4f5b0ac246c183
# < make -s -j 8 ARCH=arm64 O=/kisskb/build/npiggin_arm64-allnoconfig_arm64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  allnoconfig
# make -s -j 8 ARCH=arm64 O=/kisskb/build/npiggin_arm64-allnoconfig_arm64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/npiggin_arm64-allnoconfig_arm64-gcc8
# Build took: 0:00:40.441854