# git rev-parse -q --verify ff5bc793e47b537bf3e904fada585e102c54dd8b^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test
# git rev-parse -q --verify ff5bc793e47b537bf3e904fada585e102c54dd8b^{commit}
ff5bc793e47b537bf3e904fada585e102c54dd8b
# 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/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-gcc --version
# < git log --format=%s --max-count=1 ff5bc793e47b537bf3e904fada585e102c54dd8b
# < make -s -j 80 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  defconfig
# make -s -j 80 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  
FIT description: Linux 4.17.0-rc3-gff5bc79
Created:         Wed Jun  6 23:37:40 2018
 Image 0 (kernel@0)
  Description:  Linux 4.17.0-rc3-gff5bc79
  Created:      Wed Jun  6 23:37:40 2018
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4456515 Bytes = 4352.07 kB = 4.25 MB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x808905a0
  Hash algo:    sha1
  Hash value:   3135e2d16607de892c12d296bb47d3bd47ae51a3
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Wed Jun  6 23:37:40 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    3668 Bytes = 3.58 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   569c37cc891ce1e1f3a193cb41cc691a5d2debb5
 Image 2 (fdt@ni169445)
  Description:  NI 169445 device tree
  Created:      Wed Jun  6 23:37:40 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    1871 Bytes = 1.83 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   51b89b31605ee62038c8468c429af091dfc75ec7
 Default Configuration: 'conf@default'
 Configuration 0 (conf@default)
  Description:  Generic Linux kernel
  Kernel:       kernel@0
 Configuration 1 (conf@boston)
  Description:  Boston Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@boston
 Configuration 2 (conf@ni169445)
  Description:  NI 169445 Linux Kernel
  Kernel:       kernel@0
  FDT:          fdt@ni169445
Completed OK
# rm -rf /kisskb/build/powerpc-next_mips-defconfig_mipsel
# Build took: 0:02:12.602444