powerpc: Remove the unneeded trigger of decrementer interrupt in decrementer_check_ov...

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>

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 5cbcf4d..32fa52e 100644 (file)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -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;
 }