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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-05-22 02:41:36 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-06-10 13:37:10 -0700
commitd62840995a99c9766803d54e9d7923f247a1c1db (patch)
treed278186c5541f3294a263edc19a15b4e1809cb06 /include/linux/tracepoint.h
parent317ddd256b9c24b0d78fa8018f80f1e495481a10 (diff)
trace: Allow idle-safe tracepoints to be called from irq
__DECLARE_TRACE_RCU() currently creates an _rcuidle() tracepoint which may safely be invoked from what RCU considers to be an idle CPU. However, these _rcuidle() tracepoints may -not- be invoked from the handler of an irq taken from idle, because rcu_idle_enter() zeroes RCU's nesting-level counter, so that the rcu_irq_exit() returning to idle will trigger a WARN_ON_ONCE(). This commit therefore substitutes rcu_irq_enter() for rcu_idle_exit() and rcu_irq_exit() for rcu_idle_enter() in order to make the _rcuidle() tracepoints usable from irq handlers as well as from process context. Reported-by: Dave Jones <davej@redhat.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/tracepoint.h')
-rw-r--r--include/linux/tracepoint.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 2f322c38bd4d..f8e084d0fc77 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -145,8 +145,8 @@ static inline void tracepoint_synchronize_unregister(void)
TP_PROTO(data_proto), \
TP_ARGS(data_args), \
TP_CONDITION(cond), \
- rcu_idle_exit(), \
- rcu_idle_enter()); \
+ rcu_irq_enter(), \
+ rcu_irq_exit()); \
}
#else
#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)