This is a note to let you know that I've just added the patch titled powerpc/603: Always fault when _PAGE_ACCESSED is not set to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-603-always-fault-when-_page_accessed-is-not-set.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 11522448e641e8f1690c9db06e01985e8e19b401 Mon Sep 17 00:00:00 2001 From: Christophe Leroy <christophe.leroy@xxxxxxxxxx> Date: Sat, 10 Oct 2020 15:14:30 +0000 Subject: powerpc/603: Always fault when _PAGE_ACCESSED is not set From: Christophe Leroy <christophe.leroy@xxxxxxxxxx> commit 11522448e641e8f1690c9db06e01985e8e19b401 upstream. The kernel expects pte_young() to work regardless of CONFIG_SWAP. Make sure a minor fault is taken to set _PAGE_ACCESSED when it is not already set, regardless of the selection of CONFIG_SWAP. Fixes: 84de6ab0e904 ("powerpc/603: don't handle PAGE_ACCESSED in TLB miss handlers.") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/a44367744de54e2315b2f1a8cbbd7f88488072e0.1602342806.git.christophe.leroy@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/kernel/head_32.S | 12 ------------ 1 file changed, 12 deletions(-) --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -418,11 +418,7 @@ InstructionTLBMiss: cmplw 0,r1,r3 #endif mfspr r2, SPRN_SPRG_PGDIR -#ifdef CONFIG_SWAP li r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC -#else - li r1,_PAGE_PRESENT | _PAGE_EXEC -#endif #if defined(CONFIG_MODULES) || defined(CONFIG_DEBUG_PAGEALLOC) bge- 112f lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ @@ -484,11 +480,7 @@ DataLoadTLBMiss: lis r1,PAGE_OFFSET@h /* check if kernel address */ cmplw 0,r1,r3 mfspr r2, SPRN_SPRG_PGDIR -#ifdef CONFIG_SWAP li r1, _PAGE_PRESENT | _PAGE_ACCESSED -#else - li r1, _PAGE_PRESENT -#endif bge- 112f lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ @@ -564,11 +556,7 @@ DataStoreTLBMiss: lis r1,PAGE_OFFSET@h /* check if kernel address */ cmplw 0,r1,r3 mfspr r2, SPRN_SPRG_PGDIR -#ifdef CONFIG_SWAP li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED -#else - li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT -#endif bge- 112f lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ Patches currently in stable-queue which might be from christophe.leroy@xxxxxxxxxx are queue-5.4/powerpc-603-always-fault-when-_page_accessed-is-not-set.patch