# 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_powerpc-allmodconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  allmodconfig
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_SAMPLES=n
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_powerpc-allmodconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_powerpc-allmodconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/sound/aoa/codecs/onyx.c: In function 'onyx_snd_single_bit_get':
/kisskb/src/sound/aoa/codecs/onyx.c:380:37: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ucontrol->value.integer.value[0] = !!(c & mask) ^ polarity;
                                     ^
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
/kisskb/src/arch/powerpc/include/asm/io.h:633:3: warning: 'px_is' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ppc_pci_io.name al;    \
   ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:14: note: 'px_is' was declared here
  u32 px_cmd, px_is, px_val;
              ^
In file included from /kisskb/src/include/linux/io.h:25:0,
                 from /kisskb/src/include/linux/of_address.h:7,
                 from /kisskb/src/drivers/ata/ahci_qoriq.c:18:
/kisskb/src/arch/powerpc/include/asm/io.h:142:2: warning: 'px_cmd' may be used uninitialized in this function [-Wmaybe-uninitialized]
  __asm__ __volatile__("sync;"#insn" %1,%y0"   \
  ^
/kisskb/src/drivers/ata/ahci_qoriq.c:86:6: note: 'px_cmd' was declared here
  u32 px_cmd, px_is, px_val;
      ^
WARNING: vmlinux.o(.text+0x37c04c): Section mismatch in reference from the function .devm_memremap_pages() to the function .meminit.text:.arch_add_memory()
The function .devm_memremap_pages() references
the function __meminit .arch_add_memory().
This is often because .devm_memremap_pages lacks a __meminit 
annotation or the annotation of .arch_add_memory is wrong.

WARNING: vmlinux.o(.text+0x37c938): Section mismatch in reference from the function .devm_memremap_pages_release() to the function .meminit.text:.arch_remove_memory()
The function .devm_memremap_pages_release() references
the function __meminit .arch_remove_memory().
This is often because .devm_memremap_pages_release lacks a __meminit 
annotation or the annotation of .arch_remove_memory is wrong.

WARNING: vmlinux.o(.text+0x4b0d1c): Section mismatch in reference from the function .hmm_devmem_release() to the function .meminit.text:.arch_remove_memory()
The function .hmm_devmem_release() references
the function __meminit .arch_remove_memory().
This is often because .hmm_devmem_release lacks a __meminit 
annotation or the annotation of .arch_remove_memory is wrong.

WARNING: vmlinux.o(.text+0x4b1080): Section mismatch in reference from the function .hmm_devmem_pages_create() to the function .meminit.text:.arch_add_memory()
The function .hmm_devmem_pages_create() references
the function __meminit .arch_add_memory().
This is often because .hmm_devmem_pages_create lacks a __meminit 
annotation or the annotation of .arch_add_memory is wrong.

Completed OK
# rm -rf /kisskb/build/powerpc-next_powerpc-allmodconfig_powerpc-5.3
# Build took: 0:14:31.543281