Being able to use the atomic notifier from cpu idle entry to ensure the tracer flush the last events in the current subbuffer requires the rcu read-side to be marked "notrace".
Also apply to the the die notifier. Signed-off-by: Mathieu Desnoyers <[email protected]> Reviewed-by: Paul E. McKenney <[email protected]> Reviewed-by: Masami Hiramatsu <[email protected]> CC: Jason Baron <[email protected]> CC: [email protected] --- kernel/notifier.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) Index: linux-2.6-lttng/kernel/notifier.c =================================================================== --- linux-2.6-lttng.orig/kernel/notifier.c 2009-11-12 17:58:56.000000000 -0500 +++ linux-2.6-lttng/kernel/notifier.c 2009-11-12 18:03:28.000000000 -0500 @@ -148,7 +148,7 @@ int atomic_notifier_chain_unregister(str spin_lock_irqsave(&nh->lock, flags); ret = notifier_chain_unregister(&nh->head, n); spin_unlock_irqrestore(&nh->lock, flags); - synchronize_rcu(); + synchronize_sched(); return ret; } EXPORT_SYMBOL_GPL(atomic_notifier_chain_unregister); @@ -178,9 +178,9 @@ int __kprobes __atomic_notifier_call_cha { int ret; - rcu_read_lock(); + rcu_read_lock_sched_notrace(); ret = notifier_call_chain(&nh->head, val, v, nr_to_call, nr_calls); - rcu_read_unlock(); + rcu_read_unlock_sched_notrace(); return ret; } EXPORT_SYMBOL_GPL(__atomic_notifier_call_chain); _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
