# 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-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 b7a2d47af3a0d58527e3a53ab85f597cd495b7ce # < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_sbc8548_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- 85xx/sbc8548_defconfig # < make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_sbc8548_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_sbc8548_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 24 ARCH=powerpc O=/kisskb/build/powerpc-next_85xx_sbc8548_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- INFO: Uncompressed kernel (size 0x4e8fe8) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) INFO: Uncompressed kernel (size 0x4d8a00) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x500000) Image Name: Linux-5.11.0-rc2-gb7a2d47af3a0 Created: Fri Feb 12 04:16:40 2021 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2504185 Bytes = 2445.49 KiB = 2.39 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.11.0-rc2-gb7a2d47af3a0 Created: Fri Feb 12 04:16:40 2021 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2535003 Bytes = 2475.59 KiB = 2.42 MiB Load Address: 00500000 Entry Point: 005002a4 Completed OK # rm -rf /kisskb/build/powerpc-next_85xx_sbc8548_defconfig_powerpc-gcc4.9 # Build took: 0:00:53.546212