# git rev-parse -q --verify 49c7f0bdba27e02d44014e07d9d7723058b7b876^{commit} 49c7f0bdba27e02d44014e07d9d7723058b7b876 already have revision, skipping fetch # git checkout -q -f -B kisskb 49c7f0bdba27e02d44014e07d9d7723058b7b876 # git clean -qxdf # < git log -1 # commit 49c7f0bdba27e02d44014e07d9d7723058b7b876 # Author: Aneesh Kumar K.V # Date: Thu Aug 27 09:39:31 2020 +0530 # # powerpc/book3s64/pkeys: Optimize FTR_KUAP and FTR_KUEP disabled case # # If FTR_KUAP is disabled kernel will continue to run with the same AMR # value with which it was entered. Hence there is a high chance that # we can return without restoring the AMR value. This also helps the case # when applications are not using the pkey feature. In this case, different # applications will have the same AMR values and hence we can avoid restoring # AMR in this case too. # # Also avoid isync() if not really needed. # # Do the same for IAMR. # # null-syscall benchmark results: # # With smap/smep disabled: # Without patch: # 957.95 ns 2778.17 cycles # With patch: # 858.38 ns 2489.30 cycles # # With smap/smep enabled: # Without patch: # 1017.26 ns 2950.36 cycles # With patch: # 1021.51 ns 2962.44 cycles # # Signed-off-by: Aneesh Kumar K.V # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20200827040931.297759-24-aneesh.kumar@linux.ibm.com # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 49c7f0bdba27e02d44014e07d9d7723058b7b876 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_tqm8xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- tqm8xx_defconfig # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_tqm8xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_tqm8xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_tqm8xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- Completed OK # rm -rf /kisskb/build/powerpc-next_tqm8xx_defconfig_powerpc-gcc4.9 # Build took: 0:00:40.948281