# git rev-parse -q --verify 8bf550499c94b27dae4b551df562a774c580e85b^{commit} 8bf550499c94b27dae4b551df562a774c580e85b already have revision, skipping fetch # git checkout -q -f -B kisskb 8bf550499c94b27dae4b551df562a774c580e85b # git clean -qxdf # < git log -1 # commit 8bf550499c94b27dae4b551df562a774c580e85b # Author: Michael Ellerman # Date: Fri May 19 16:44:10 2023 +1000 # # powerpc/mm: Reinstate ARCH_FORCE_MAX_ORDER ranges # # Commit 1e8fed873e74 ("powerpc: drop ranges for definition of # ARCH_FORCE_MAX_ORDER") removed the limits on the possible values for # ARCH_FORCE_MAX_ORDER. # # However removing the ranges entirely causes some common work flows to # break. For example building a defconfig (which uses 64K pages), changing # the page size to 4K, and rebuilding used to work, because # ARCH_FORCE_MAX_ORDER would be clamped to 12 by the ranges. # # With the ranges removed it creates a kernel that builds but crashes at # boot: # kernel BUG at mm/huge_memory.c:470! # Oops: Exception in kernel mode, sig: 5 [#1] # ... # NIP hugepage_init+0x9c/0x278 # LR do_one_initcall+0x80/0x320 # Call Trace: # do_one_initcall+0x80/0x320 # kernel_init_freeable+0x304/0x3ac # kernel_init+0x30/0x1a0 # ret_from_kernel_user_thread+0x14/0x1c # # The reasoning for removing the ranges was that some of the values were # too large. So take that into account and limit the maximums to 10 which # is the default max, except for the 4K case which uses 12. # # Fixes: 1e8fed873e74 ("powerpc: drop ranges for definition of ARCH_FORCE_MAX_ORDER") # Signed-off-by: Michael Ellerman # < /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 8bf550499c94b27dae4b551df562a774c580e85b # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 83xx/kmeter1_defconfig # < make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 160 ARCH=powerpc O=/kisskb/build/powerpc-fixes_83xx_kmeter1_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-fixes_83xx_kmeter1_defconfig_powerpc-gcc5 # Build took: 0:00:35.906167