From: Paul Mundt <lethal@linux-sh.org>
Date: Wed, 26 Nov 2008 06:22:50 +0000 (+0900)
Subject: sh: do not latency trace idle.
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=f74c034d52d0f908d5b929423a680962a2586199;p=deliverable%2Flinux.git

sh: do not latency trace idle.

Description snipped from Steven Rostedt's PPC patch:

    When idle is called, interrupts are blocked, 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: Paul Mundt <lethal@linux-sh.org>
---

diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index 908731c49afb..e781540bd991 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -59,8 +59,12 @@ static void default_idle(void)
 		clear_thread_flag(TIF_POLLING_NRFLAG);
 		smp_mb__after_clear_bit();
 		set_bl_bit();
+		stop_critical_timings();
+
 		while (!need_resched())
 			cpu_sleep();
+
+		start_critical_timings();
 		clear_bl_bit();
 		set_thread_flag(TIF_POLLING_NRFLAG);
 	} else