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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-02-02 15:42:04 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-02-21 09:06:13 -0800 |
| commit | 8a2ecf474d3ee8dd5d001490349e422cec52f39f (patch) | |
| tree | aa706d632a059dd10d9305cc6abbea5889a839d9 /kernel/rcutiny.c | |
| parent | 29e37d814188ac8d60f2120583704d3ef6d634b4 (diff) | |
| download | linux-8a2ecf474d3ee8dd5d001490349e422cec52f39f.tar.gz linux-8a2ecf474d3ee8dd5d001490349e422cec52f39f.tar.bz2 linux-8a2ecf474d3ee8dd5d001490349e422cec52f39f.zip | |
rcu: Add RCU_NONIDLE() for idle-loop RCU read-side critical sections
RCU, RCU-bh, and RCU-sched read-side critical sections are forbidden
in the inner idle loop, that is, between the rcu_idle_enter() and the
rcu_idle_exit() -- RCU will happily ignore any such read-side critical
sections. However, things like powertop need tracepoints in the inner
idle loop.
This commit therefore provides an RCU_NONIDLE() macro that can be used to
wrap code in the idle loop that requires RCU read-side critical sections.
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutiny.c')
| -rw-r--r-- | kernel/rcutiny.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c index c8b0e1582c04..37a5444204d2 100644 --- a/kernel/rcutiny.c +++ b/kernel/rcutiny.c @@ -97,6 +97,7 @@ void rcu_idle_enter(void) rcu_idle_enter_common(oldval); local_irq_restore(flags); } +EXPORT_SYMBOL_GPL(rcu_idle_enter); /* * Exit an interrupt handler towards idle. @@ -153,6 +154,7 @@ void rcu_idle_exit(void) rcu_idle_exit_common(oldval); local_irq_restore(flags); } +EXPORT_SYMBOL_GPL(rcu_idle_exit); /* * Enter an interrupt handler, moving away from idle. |