powerpc: Remove the unneeded trigger of decrementer interrupt in decrementer_check_ov...
authorKevin Hao <haokexin@gmail.com>
Wed, 17 Apr 2013 09:50:35 +0000 (17:50 +0800)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Thu, 20 Jun 2013 06:55:10 +0000 (16:55 +1000)
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>
arch/powerpc/kernel/irq.c

index 5cbcf4d5a808db3f2d25fdc4fe01ea26e3d0f247..32fa52e8163fa67ba2e7c9209d264cbf0a06a61f 100644 (file)
@@ -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;
 }