powerpc/8xx: Don't touch ACCESSED when no SWAP.

Only the swap function cares about the ACCESSED bit in
the pte. Do not waste cycles updateting ACCESSED when swap
is not compiled into the kernel.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 84ca1d9b9ed3..6478a9632552 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -343,10 +343,11 @@ InstructionTLBMiss:
         mfspr   r11, SPRN_MD_TWC        /* ....and get the pte address */
         lwz     r10, 0(r11)     /* Get the pte */
 
+#ifdef CONFIG_SWAP
         andi.   r11, r10, _PAGE_ACCESSED | _PAGE_PRESENT
         cmpwi   cr0, r11, _PAGE_ACCESSED | _PAGE_PRESENT
         bne-    cr0, 2f
-
+#endif
         /* The Linux PTE won't go exactly into the MMU TLB.
          * Software indicator bits 21 and 28 must be clear.
          * Software indicator bits 24, 25, 26, and 27 must be
@@ -439,10 +440,11 @@ DataStoreTLBMiss:
          * r11 = ((r10 & PRESENT) & ((r10 & ACCESSED) >> 5));
          * r10 = (r10 & ~PRESENT) | r11;
          */
+#ifdef CONFIG_SWAP
         rlwinm  r11, r10, 32-5, _PAGE_PRESENT
         and     r11, r11, r10
         rlwimi  r10, r11, 0, _PAGE_PRESENT
-
+#endif
         /* Honour kernel RO, User NA */
         /* 0x200 == Extended encoding, bit 22 */
         rlwimi  r10, r10, 32-2, 0x200 /* Copy USER to bit 22, 0x200 */