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trace: Allow idle-safe tracepoints to be called from irq

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__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>
This commit is contained in:
Paul E. McKenney 2013-05-22 02:41:36 -07:00
parent 317ddd256b
commit d62840995a
1 changed files with 2 additions and 2 deletions
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4
include/linux/tracepoint.h
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@ -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)