From d069cb4373fe0d451357c4d3769623a7564dfa9f Mon Sep 17 00:00:00 2001 From: Joakim Tjernlund Date: Tue, 2 Mar 2010 05:37:11 +0000 Subject: [PATCH] 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/head_8xx.S | 6 ++++-- 1 file 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 */ -- 2.39.2