From 0540b0d2ce9073fd2a736d636218faa61c99e572 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Sat, 10 Oct 2020 15:14:29 +0000 Subject: [PATCH] powerpc/40x: Always fault when _PAGE_ACCESSED is not set 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: 2c74e2586bb9 ("powerpc/40x: Rework 40x PTE access and TLB miss") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b02ca2ed2d3676a096219b48c0f69ec982a75bcf.1602342801.git.christophe.leroy@csgroup.eu --- arch/powerpc/kernel/head_40x.S | 8 -------- 1 file changed, 8 deletions(-) diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index 44c9018aed1b..a1ae00689e0f 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -284,11 +284,7 @@ _ENTRY(saved_ksp_limit) rlwimi r11, r10, 22, 20, 29 /* Compute PTE address */ lwz r11, 0(r11) /* Get Linux PTE */ -#ifdef CONFIG_SWAP li r9, _PAGE_PRESENT | _PAGE_ACCESSED -#else - li r9, _PAGE_PRESENT -#endif andc. r9, r9, r11 /* Check permission */ bne 5f @@ -369,11 +365,7 @@ _ENTRY(saved_ksp_limit) rlwimi r11, r10, 22, 20, 29 /* Compute PTE address */ lwz r11, 0(r11) /* Get Linux PTE */ -#ifdef CONFIG_SWAP li r9, _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC -#else - li r9, _PAGE_PRESENT | _PAGE_EXEC -#endif andc. r9, r9, r11 /* Check permission */ bne 5f