From 5a0f82bb6118fb1c51e6516ffc3377d7e5e1ef39 Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Tue, 9 Mar 2010 17:22:18 +0800 Subject: MIPS: Don't trace irqsoff for idle As the X86 platform did in arch/x86/kernel/{process_32.c,process_64.c}, we also don't trace irqsoff for idle. If "There's no useful work to be done", we don't care about the irqsoff duration. If we trace for idle, the max duration of irqsoff will be always as the idle time and eventually make the irqsoff tracer out of action. Signed-off-by: Wu Zhangjin --- arch/mips/kernel/process.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index f3d73e1831c1..87316fc509a1 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -64,8 +64,12 @@ void __noreturn cpu_idle(void) smtc_idle_loop_hook(); #endif - if (cpu_wait) + if (cpu_wait) { + /* Don't trace irqs off for idle */ + stop_critical_timings(); (*cpu_wait)(); + start_critical_timings(); + } } #ifdef CONFIG_HOTPLUG_CPU if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) && -- cgit v1.2.3