# git rev-parse -q --verify b7a2d47af3a0d58527e3a53ab85f597cd495b7ce^{commit} b7a2d47af3a0d58527e3a53ab85f597cd495b7ce already have revision, skipping fetch # git checkout -q -f -B kisskb b7a2d47af3a0d58527e3a53ab85f597cd495b7ce # git clean -qxdf # < git log -1 # commit b7a2d47af3a0d58527e3a53ab85f597cd495b7ce # Author: Jordan Niethe # Date: Mon Feb 8 14:29:57 2021 +1100 # # selftests/powerpc: Test for spurious kernel memory faults on radix # # Previously when mapping kernel memory on radix, no ptesync was # included which would periodically lead to unhandled spurious faults. # Mapping kernel memory is used when code patching with Strict RWX # enabled. As suggested by Chris Riedl, turning ftrace on and off does a # large amount of code patching so is a convenient way to see this kind # of fault. # # Add a selftest to try and trigger this kind of a spurious fault. It # tests for 30 seconds which is usually long enough for the issue to # show up. # # Signed-off-by: Jordan Niethe # [mpe: Rename it to better reflect what it does, rather than the symptom] # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20210208032957.1232102-2-jniethe5@gmail.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 b7a2d47af3a0d58527e3a53ab85f597cd495b7ce # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- ppc64_defconfig # < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- Completed OK # rm -rf /kisskb/build/powerpc-next_ppc64_defconfig_powerpc-gcc5 # Build took: 0:04:11.673807