On Thu, 06 Jul 2023 07:54:05 +0530, Aneesh Kumar K.V wrote: > 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 > > [...]
Applied to powerpc/fixes. [1/1] powerpc/mm/book3s64/hash/4k: Add pmd_same callback for 4K page size https://git.kernel.org/powerpc/c/cf53564b11cef5cdfafc548b172345c9aa753f89 cheers