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Commit e8775d4a authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
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powerpc/book3e: Don't re-trigger decrementer on lazy irq restore 



The decrementer on BookE acts as a level interrupt and doesn't
need to be re-triggered when going negative. It doesn't go
negative anyways (unless programmed to auto-reload with a
negative value) as it stops when reaching 0.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent b9f1cd71

arch/powerpc/kernel/irq.c

+9 −0
Original line number Diff line number Diff line
@@ -159,8 +159,17 @@ notrace void raw_local_irq_restore(unsigned long en) 
	 * use local_paca instead of get_paca() to avoid preemption checking.

	 */

	local_paca->hard_enabled = en;



#ifndef CONFIG_BOOKE

	/* On server, re-trigger the decrementer if it went negative since

	 * some processors only trigger on edge transitions of the sign bit.

	 *

	 * BookE has a level sensitive decrementer (latches in TSR) so we

	 * don't need that

	 */

	if ((int)mfspr(SPRN_DEC) < 0)

		mtspr(SPRN_DEC, 1);

#endif /* CONFIG_BOOKE */



	/*

	 * Force the delivery of pending soft-disabled interrupts on PS3.