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 908731c49afb92122518ab804e3bf1f4d7435b3c..e781540bd991f4e46681dfb9ef6e908f915ef9d5 100644 (file)
--- 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