Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b38fd4...
Commit: b38fd42ff46a4a31dced8533e8a6e549693500b6
Parent: 33a7f122740bd820a029faf450a9a0caa9458426
Author: Kumar Gala <galak@kernel.crashing.org>
AuthorDate: Wed Jul 16 16:17:08 2008 -0500
Committer: Kumar Gala <galak@kernel.crashing.org>
CommitDate: Fri Sep 19 13:31:04 2008 -0500
powerpc/fsl-booke: Fixup 64-bit PTE reading for SMP support
We need to create a false data dependency to ensure the loads of
the pte are done in the right order.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
arch/powerpc/kernel/head_fsl_booke.S | 26 +++++++++++++++++++++-----
1 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 3cb52fa..377e0c1 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -579,13 +579,19 @@ interrupt_base:
FIND_PTE
andc. r13,r13,r11 /* Check permission */
- bne 2f /* Bail if permission mismach */
#ifdef CONFIG_PTE_64BIT
- lwz r13, 0(r12)
+#ifdef CONFIG_SMP
+ subf r10,r11,r12 /* create false data dep */
+ lwzx r13,r11,r10 /* Get upper pte bits */
+#else
+ lwz r13,0(r12) /* Get upper pte bits */
+#endif
#endif
- /* Jump to common tlb load */
+ bne 2f /* Bail if permission/valid mismach */
+
+ /* Jump to common tlb load */
b finish_tlb_load
2:
/* The bailout. Restore registers to pre-exception conditions
@@ -640,10 +646,20 @@ interrupt_base:
FIND_PTE
andc. r13,r13,r11 /* Check permission */
+
+#ifdef CONFIG_PTE_64BIT
+#ifdef CONFIG_SMP
+ subf r10,r11,r12 /* create false data dep */
+ lwzx r13,r11,r10 /* Get upper pte bits */
+#else
+ lwz r13,0(r12) /* Get upper pte bits */
+#endif
+#endif
+
bne 2f /* Bail if permission mismach */
#ifdef CONFIG_PTE_64BIT
- lwz r13, 0(r12)
+ lwz r13,0(r12)
#endif
/* Jump to common TLB load point */
@@ -702,7 +718,7 @@ interrupt_base:
/*
* Both the instruction and data TLB miss get to this
* point to load the TLB.
- * r10 - EA of fault
+ * r10 - available to use
* r11 - TLB (info from Linux PTE)
* r12 - available to use
* r13 - upper bits of PTE (if PTE_64BIT) or available to use
--
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