From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Benjamin Herrenschmidt <b...@kernel.crashing.org>
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 <b...@kernel.crashing.org>
Tested-by: Steven Rostedt <rost...@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
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 */
--
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