powerpc: Fix missing/delayed calls to irq_work

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@kernel.crashing.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index d7ebc58c907beaeda96ebbe081d7d54d20388858..071592bbe02547ddcd8a03ac25cd0926a201202f 100644 (file)
--- 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 */