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Commit 689dfa89 authored by Tiejun Chen's avatar Tiejun Chen Committed by Benjamin Herrenschmidt
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powerpc: Max next_tb to prevent from replaying timer interrupt 



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: default avatarTiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent fefd9e6f

arch/powerpc/kernel/time.c

+7 −2
Original line number Diff line number Diff line
@@ -494,10 +494,15 @@ void timer_interrupt(struct pt_regs * regs) 
	set_dec(DECREMENTER_MAX);



	/* 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;

	}



	/* Conditionally hard-enable interrupts now that the DEC has been

	 * bumped to its maximum value