# git rev-parse -q --verify c8635bc26fc137c218cba3b48a834a667e3ac790^{commit}
c8635bc26fc137c218cba3b48a834a667e3ac790
already have revision, skipping fetch
# git checkout -q -f -B kisskb c8635bc26fc137c218cba3b48a834a667e3ac790
# git clean -qxdf
# < git log -1
# commit c8635bc26fc137c218cba3b48a834a667e3ac790
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Sun May 13 14:21:06 2018 +1000
# 
#     powerpc/64s/radix: optimise pte_update
#     
#     Implementing pte_update with pte_xchg (which uses cmpxchg) is
#     inefficient. A single larx/stcx. works fine, no need for the less
#     efficient cmpxchg sequence.
#     
#     Then remove the memory barriers from the operation. There is a
#     requirement for TLB flushing to load mm_cpumask after the store
#     that reduces pte permissions, which is moved into the TLB flush
#     code.
#     
#     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 c8635bc26fc137c218cba3b48a834a667e3ac790
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ep88xc_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ep88xc_defconfig
# make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ep88xc_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
/kisskb/src/arch/powerpc/mm/fault.c: In function '__do_page_fault':
/kisskb/src/arch/powerpc/mm/fault.c:520:7: error: implicit declaration of function 'fault_in_pages_readable' [-Werror=implicit-function-declaration]
   if (fault_in_pages_readable((const char __user *)regs->nip,
       ^
cc1: all warnings being treated as errors
/kisskb/src/scripts/Makefile.build:312: recipe for target 'arch/powerpc/mm/fault.o' failed
make[2]: *** [arch/powerpc/mm/fault.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/kisskb/src/Makefile:1060: recipe for target 'arch/powerpc/mm' failed
make[1]: *** [arch/powerpc/mm] Error 2
make[1]: *** Waiting for unfinished jobs....
Makefile:146: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_ep88xc_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/powerpc-next_ep88xc_defconfig_powerpc-5.3
# Build took: 0:00:16.520581