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powerpc: Max next_tb to prevent from replaying timer interrupt

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With lazy interrupt, we always call __check_irq_replaysome with
decrementers_next_tb to check if we need to replay timer interrupt.
So in hotplug case we also need to set decrementers_next_tb as MAX
to make sure __check_irq_replay don't replay timer interrupt
when return as we expect, otherwise we'll trap here infinitely.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Tiejun Chen 2013-01-15 17:01:19 +00:00 committed by Benjamin Herrenschmidt
parent fefd9e6f88
commit 689dfa894c
1 changed files with 7 additions and 2 deletions
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9
arch/powerpc/kernel/time.c
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@ -494,10 +494,15 @@ void timer_interrupt(struct pt_regs * regs)
set_dec(DECREMENTER_MAX); set_dec(DECREMENTER_MAX);
/* Some implementations of hotplug will get timer interrupts while /* Some implementations of hotplug will get timer interrupts while
* offline, just ignore these * offline, just ignore these and we also need to set
* decrementers_next_tb as MAX to make sure __check_irq_replay
* don't replay timer interrupt when return, otherwise we'll trap
* here infinitely :(
*/ */
if (!cpu_online(smp_processor_id())) if (!cpu_online(smp_processor_id())) {
*next_tb = ~(u64)0;
return; return;
}
/* Conditionally hard-enable interrupts now that the DEC has been /* Conditionally hard-enable interrupts now that the DEC has been
* bumped to its maximum value * bumped to its maximum value