On 13 September 2012 02:00, Simon Horman [off-list ref] wrote:

On Wed, Sep 12, 2012 at 10:59:35AM -0700, Stephen Boyd wrote:

quoted

On 09/12/12 00:14, Simon Horman wrote:

quoted

@@ -1423,6 +1423,15 @@ config ARM_ERRATA_775420
          deadlock. This workaround puts DSB before executing ISB at the
          beginning of the abort exception handler.

+config ARM_ERRATA_782773
+   bool "ARM errata: Updating a translation entry might cause an unexpected translation fault"
+   depends on CPU_V7
+   help
+     This option enables the workaround for the 782773 Cortex-A9 (all r0,
+     ,r2 and r3 revisions) erratum. It might cause MMU exception in case

Seems to be an extra comma here.

Thanks, here is an updated version.

From: Kouei Abe <redacted>

arm: Add ARM ERRATA 782773 workaround

Signed-off-by: Kouei Abe <redacted>
Signed-off-by: Simon Horman <horms@verge.net.au>

I would add some text to the commit log as well, even though it
matches the Kconfig entry.

Have you hit this in practice? In general the kernel shouldn't access
kernel virtual address corresponding to a page table that is being
changed. For user address space it is possible but the kernel can
handle use translation faults, even though they may be spurious.

-- 
Catalin