# git rev-parse -q --verify 1b04d12351d7bb1139d26e63a94ccf71aa666016^{commit}
1b04d12351d7bb1139d26e63a94ccf71aa666016
already have revision, skipping fetch
# git checkout -q -f -B kisskb 1b04d12351d7bb1139d26e63a94ccf71aa666016
# git clean -qxdf
# < git log -1
# commit 1b04d12351d7bb1139d26e63a94ccf71aa666016
# Author: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
# Date:   Thu Jul 6 07:54:05 2023 +0530
# 
#     powerpc/mm/book3s64/hash/4k: Add pmd_same callback for 4K page size
#     
#     With commit 0d940a9b270b ("mm/pgtable: allow pte_offset_map[_lock]() to
#     fail") the kernel is now using pmd_same to compare pmd values that are
#     pointing to a level 4 page table page. Move the functions out of #ifdef
#     CONFIG_TRANSPARENT_HUGEPAGE and add a variant that can work with both 4K
#     and 64K page size.
#     
#     kernel BUG at arch/powerpc/include/asm/book3s/64/hash-4k.h:141!
#     Oops: Exception in kernel mode, sig: 5 [#1]
#     LE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
#     .....
#     NIP [c00000000048aee0] __pte_offset_map_lock+0xf0/0x164
#     LR [c00000000048ae78] __pte_offset_map_lock+0x88/0x164
#     Call Trace:
#      0xc0003f000009a340 (unreliable)
#      __handle_mm_fault+0x1340/0x1980
#      handle_mm_fault+0xbc/0x380
#      __get_user_pages+0x320/0x550
#      get_user_pages_remote+0x13c/0x520
#      get_arg_page+0x80/0x1d0
#      copy_string_kernel+0xc8/0x250
#      kernel_execve+0x11c/0x270
#      run_init_process+0xe4/0x10c
#      kernel_init+0xbc/0x1a0
#      ret_from_kernel_user_thread+0x14/0x1c
#     
#     Reported-by: Michael Ellerman <mpe@ellerman.id.au>
#     Signed-off-by: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
#     Acked-by: Hugh Dickins <hughd@google.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20230706022405.798157-1-aneesh.kumar@linux.ibm.com
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 1b04d12351d7bb1139d26e63a94ccf71aa666016
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_x86_64_defconfig_x86_64-gcc8
# Build took: 0:02:06.305270