This is a note to let you know that I've just added the patch titled
powerpc: Fix missing/delayed calls to irq_work
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-fix-missing-delayed-calls-to-irq_work.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 230b3034793247f61e6a0b08c44cf415f6d92981 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 15 Jun 2013 12:13:40 +1000
Subject: powerpc: Fix missing/delayed calls to irq_work
From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
commit 230b3034793247f61e6a0b08c44cf415f6d92981 upstream.
When replaying interrupts (as a result of the interrupt occurring
while soft-disabled), in the case of the decrementer, we are exclusively
testing for a pending timer target. However we also use decrementer
interrupts to trigger the new "irq_work", which in this case would
be missed.
This change the logic to force a replay in both cases of a timer
boundary reached and a decrementer interrupt having actually occurred
while disabled. The former test is still useful to catch cases where
a CPU having been hard-disabled for a long time completely misses the
interrupt due to a decrementer rollover.
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Tested-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/irq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(
* in case we also had a rollover while hard disabled
*/
local_paca->irq_happened &= ~PACA_IRQ_DEC;
- if (decrementer_check_overflow())
+ if ((happened & PACA_IRQ_DEC) || decrementer_check_overflow())
return 0x900;
/* Finally check if an external interrupt happened */
Patches currently in stable-queue which might be from benh@xxxxxxxxxxxxxxxxxxx are
queue-3.4/powerpc-fix-missing-delayed-calls-to-irq_work.patch
queue-3.4/powerpc-fix-stack-overflow-crash-in-resume_kernel-when-ftracing.patch
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