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powerpc: ftrace, do not latency trace idle 

Impact: fix for irq off latency tracer

When idle is called, interrupts are disabled, but the idle function
will still wake up on an interrupt. The problem is that the interrupt
disabled latency tracer will take this call to idle as a latency.

This patch disables the latency tracing when going into idle.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2008-11-14 16:21:19 -08:00
parent ee2f6cc7f9
commit 6d07bb4735
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/kernel/idle.c
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@ -69,10 +69,15 @@ void cpu_idle(void)
smp_mb();
local_irq_disable();
/* Don't trace irqs off for idle */
stop_critical_timings();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
start_critical_timings();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);