powerpc/603: 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: 84de6ab0e904 ("powerpc/603: don't handle PAGE_ACCESSED in TLB miss handlers.")
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/a44367744de54e2315b2f1a8cbbd7f88488072e0.1602342806.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 5eb9eed..2aa16d5 100644 (file)
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -457,11 +457,7 @@ 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)
        bgt-    112f
        lis     r2, (swapper_pg_dir - PAGE_OFFSET)@ha   /* if kernel address, use */
@@ -523,11 +519,7 @@ DataLoadTLBMiss:
        lis     r1, TASK_SIZE@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
        bgt-    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 */
@@ -603,11 +595,7 @@ DataStoreTLBMiss:
        lis     r1, TASK_SIZE@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
        bgt-    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 */