# git rev-parse -q --verify ff5bc793e47b537bf3e904fada585e102c54dd8b^{commit}
ff5bc793e47b537bf3e904fada585e102c54dd8b
already have revision, skipping fetch
# git checkout -q -f -B kisskb ff5bc793e47b537bf3e904fada585e102c54dd8b
# git clean -qxdf
# < git log -1
# commit ff5bc793e47b537bf3e904fada585e102c54dd8b
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Wed Jun 6 11:40:08 2018 +1000
# 
#     powerpc/64s/radix: Fix missing ptesync in flush_cache_vmap
#     
#     There is a typo in f1cb8f9beb ("powerpc/64s/radix: avoid ptesync after
#     set_pte and ptep_set_access_flags") config ifdef, which results in the
#     necessary ptesync not being issued after vmalloc.
#     
#     This causes random kernel faults in module load, bpf load, anywhere
#     that vmalloc mappings are used.
#     
#     After correcting the code, this survives a guest kernel booting
#     hundreds of times where previously there would be a crash every few
#     boots (I haven't noticed the crash on host, perhaps due to different
#     TLB and page table walking behaviour in hardware).
#     
#     A memory clobber is also added to the flush, just to be sure it won't
#     be reordered with the pte set or the subsequent mapping access.
#     
#     Fixes: f1cb8f9beb ("powerpc/64s/radix: avoid ptesync after set_pte and ptep_set_access_flags")
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 ff5bc793e47b537bf3e904fada585e102c54dd8b
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_pmac32_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from /kisskb/src/sound/ppc/pmac.h:25:0,
                 from /kisskb/src/sound/ppc/awacs.c:29:
/kisskb/src/sound/ppc/awacs.c: In function 'snd_pmac_awacs_init':
/kisskb/src/include/sound/control.h:223:9: warning: 'speaker_vol' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return _snd_ctl_add_slave(master, slave, 0);
         ^
/kisskb/src/sound/ppc/awacs.c:886:36: note: 'speaker_vol' was declared here
  struct snd_kcontrol *master_vol, *speaker_vol;
                                    ^
INFO: Uncompressed kernel (size 0x89c3d8) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x900000)
Completed OK
# rm -rf /kisskb/build/powerpc-next_pmac32_defconfig_powerpc-5.3
# Build took: 0:01:30.260778