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authorSteven Rostedt <srostedt@redhat.com>2008-11-14 19:21:19 -0500
committerSteven Rostedt <srostedt@redhat.com>2008-11-20 13:51:15 -0500
commit6d07bb47354174a9b52d3b03f9e38b069a93d341 (patch)
tree90a3842276fceaee61067c2791eb63a457ad0fc3 /arch/powerpc
parentee2f6cc7f9ea2542ad46070ed62ba7aa04d08871 (diff)
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/idle.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle.c b/arch/powerpc/kernel/idle.c
index 31982d05d81a..88d9c1d5e5fb 100644
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -69,10 +69,15 @@ void cpu_idle(void)
69 smp_mb(); 69 smp_mb();
70 local_irq_disable(); 70 local_irq_disable();
71 71
72 /* Don't trace irqs off for idle */
73 stop_critical_timings();
74
72 /* check again after disabling irqs */ 75 /* check again after disabling irqs */
73 if (!need_resched() && !cpu_should_die()) 76 if (!need_resched() && !cpu_should_die())
74 ppc_md.power_save(); 77 ppc_md.power_save();
75 78
79 start_critical_timings();
80
76 local_irq_enable(); 81 local_irq_enable();
77 set_thread_flag(TIF_POLLING_NRFLAG); 82 set_thread_flag(TIF_POLLING_NRFLAG);
78 83