3.5.7.15 -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: Luis Henriques <luis.henriq...@canonical.com>
---
 arch/powerpc/kernel/irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 1f017bb..86cb68e 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -162,7 +162,7 @@ notrace unsigned int __check_irq_replay(void)
         * 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 */
-- 
1.8.1.2

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