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

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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>
This commit is contained in:
Joakim Tjernlund 2010-03-02 05:37:11 +00:00 committed by Benjamin Herrenschmidt
parent 4afb0be7cc
commit d069cb4373
1 changed files with 4 additions and 2 deletions
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6
arch/powerpc/kernel/head_8xx.S
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@ -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 */