From: Christophe Leroy christophe.leroy@csgroup.eu
commit 0540b0d2ce9073fd2a736d636218faa61c99e572 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: 2c74e2586bb9 ("powerpc/40x: Rework 40x PTE access and TLB miss") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy christophe.leroy@csgroup.eu Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/b02ca2ed2d3676a096219b48c0f69ec982a75bcf.160234280... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kernel/head_40x.S | 8 -------- 1 file changed, 8 deletions(-)
--- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -285,11 +285,7 @@ _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
@@ -370,11 +366,7 @@ _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