Commit 3139b0a7 authored Apr 17, 2013 by Kevin Hao Committed by Benjamin Herrenschmidt Jun 20, 2013

powerpc: Remove the unneeded trigger of decrementer interrupt in decrementer_check_overflow



Previously in order to handle the edge sensitive decrementers,
we choose to set the decrementer to 1 to trigger a decrementer
interrupt when re-enabling interrupts. But with the rework of the
lazy EE, we would replay the decrementer interrupt when re-enabling
interrupts if a decrementer interrupt occurs with irq soft-disabled.
So there is no need to trigger a decrementer interrupt in this case
any more.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent 39a421ff

arch/powerpc/kernel/irq.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -116,8 +116,6 @@ static inline notrace int decrementer_check_overflow(void)
		u64 now = get_tb_or_rtc();
		u64 *next_tb = &__get_cpu_var(decrementers_next_tb);

		if (now >= *next_tb)
		set_dec(1);
		return now >= *next_tb;
		}

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