# 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-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-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_83xx_mpc834x_itxgp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 83xx/mpc834x_itxgp_defconfig # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_83xx_mpc834x_itxgp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_83xx_mpc834x_itxgp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-next_83xx_mpc834x_itxgp_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- INFO: Uncompressed kernel (size 0x5d6ab8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x5d6ab8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) INFO: Uncompressed kernel (size 0x5c63d0) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-5.9.0-rc2-48256-g49c7f0bdb Created: Fri Sep 11 04:31:29 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2952263 Bytes = 2883.07 KiB = 2.82 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.9.0-rc2-48256-g49c7f0bdb Created: Fri Sep 11 04:31:29 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2981379 Bytes = 2911.50 KiB = 2.84 MiB Load Address: 00600000 Entry Point: 00600294 Image Name: Linux-5.9.0-rc2-48256-g49c7f0bdb Created: Fri Sep 11 04:31:29 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2980281 Bytes = 2910.43 KiB = 2.84 MiB Load Address: 00600000 Entry Point: 00600294 Completed OK # rm -rf /kisskb/build/powerpc-next_83xx_mpc834x_itxgp_defconfig_powerpc-gcc5 # Build took: 0:00:49.387362