Bug in _und_usr on dual-core ARM?

[Russell King - ARM Linux]

On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
> Hi, All
> 
> We got an issue on our OMAP4 SMP system.
> Looks like __und_user(), which was triggered by a user space
> exception, got a page fault hence lead to might_sleep() failure.

Could you see whether this patch prevents the warning please.

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index bc0e1d8..d52b940 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 	 * If we're in an interrupt or have no user
 	 * context, we must not take the fault..
 	 */
-	if (in_atomic() || !mm)
+	if (in_atomic() || irqs_disabled() || !mm)
 		goto no_context;
 
 	/*