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 <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
rtvt123 · Apr 7, 2010 · d069cb4 · d069cb4
1 parent 4afb0be
commit d069cb4
Showing 1 changed file with 4 additions and 2 deletions.
diff --git 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 */