powerpc/8xx: use r3 to scratch CR in ITLBmiss

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index f559f21..451e789 100644 (file)
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -321,7 +321,7 @@ SystemCall:
 #endif
 
 InstructionTLBMiss:
-#ifdef CONFIG_8xx_CPU6
+#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
        mtspr   SPRN_SPRG_SCRATCH2, r3
 #endif
        EXCEPTION_PROLOG_0
@@ -329,23 +329,20 @@ InstructionTLBMiss:
        /* If we are faulting a kernel address, we have to use the
         * kernel page tables.
         */
+       mfspr   r10, SPRN_SRR0  /* Get effective address of fault */
+       INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
 #if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
        /* Only modules will cause ITLB Misses as we always
         * pin the first 8MB of kernel memory */
-       mfspr   r11, SPRN_SRR0  /* Get effective address of fault */
-       INVALIDATE_ADJACENT_PAGES_CPU15(r10, r11)
-       mfcr    r10
-       IS_KERNEL(r11, r11)
+       mfcr    r3
+       IS_KERNEL(r11, r10)
+#endif
        mfspr   r11, SPRN_M_TW  /* Get level 1 table */
+#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
        BRANCH_UNLESS_KERNEL(3f)
        lis     r11, (swapper_pg_dir-PAGE_OFFSET)@ha
 3:
-       mtcr    r10
-       mfspr   r10, SPRN_SRR0  /* Get effective address of fault */
-#else
-       mfspr   r10, SPRN_SRR0  /* Get effective address of fault */
-       INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
-       mfspr   r11, SPRN_M_TW  /* Get level 1 table base address */
+       mtcr    r3
 #endif
        /* Insert level 1 index */
        rlwimi  r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
@@ -377,7 +374,7 @@ InstructionTLBMiss:
        MTSPR_CPU6(SPRN_MI_RPN, r10, r3)        /* Update TLB entry */
 
        /* Restore registers */
-#ifdef CONFIG_8xx_CPU6
+#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
        mfspr   r3, SPRN_SPRG_SCRATCH2
 #endif
        EXCEPTION_EPILOG_0