lkml.org 
[lkml]   [2012]   [Feb]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 5/9] cpuidle/tracing: Denote the tracepoints as being in rcu_idle_exit() section
From: Steven Rostedt <srostedt@redhat.com>

As the tracepoints in the cpuidle code are called when rcu_idle_exit() is in
effect, the _rcuidle() version must be used, otherwise the rcu_read_lock()s
that protect the tracepoint will not be honored.

Cc: Len Brown <len.brown@intel.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
drivers/cpuidle/cpuidle.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 59f4261..6588f43 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -94,13 +94,13 @@ int cpuidle_idle_call(void)

target_state = &drv->states[next_state];

- trace_power_start(POWER_CSTATE, next_state, dev->cpu);
- trace_cpu_idle(next_state, dev->cpu);
+ trace_power_start_rcuidle(POWER_CSTATE, next_state, dev->cpu);
+ trace_cpu_idle_rcuidle(next_state, dev->cpu);

entered_state = target_state->enter(dev, drv, next_state);

- trace_power_end(dev->cpu);
- trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
+ trace_power_end_rcuidle(dev->cpu);
+ trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);

if (entered_state >= 0) {
/* Update cpuidle counters */
--
1.7.8.3

[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2012-02-14 04:43    [W:0.112 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site