Commit-ID: 7f5b774275df8c76a959eae7488128b637fcbfc8 Gitweb: http://git.kernel.org/tip/7f5b774275df8c76a959eae7488128b637fcbfc8 Author: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> AuthorDate: Tue, 16 Mar 2010 17:00:29 +0800 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Tue, 16 Mar 2010 10:10:40 +0100 rcu: Fix tracepoints & lockdep false positive tracepoint.h uses rcu_dereference(), which triggers this warning: [ 0.701161] =================================================== [ 0.702211] [ INFO: suspicious rcu_dereference_check() usage. ] [ 0.702716] --------------------------------------------------- [ 0.703203] include/trace/events/workqueue.h:68 invoked rcu_dereference_check() without protection! [ 0.703971] [ 0.703990] other info that might help us debug this: [ 0.703993] [ 0.705590] [ 0.705604] rcu_scheduler_active = 1, debug_locks = 0 [ 0.706712] 1 lock held by swapper/1: [ 0.707229] #0: (cpu_add_remove_lock){+.+.+.}, at: [<c0142f54>] cpu_maps_update_begin+0x14/0x20 [ 0.710097] [ 0.710106] stack backtrace: [ 0.712602] Pid: 1, comm: swapper Not tainted 2.6.34-rc1-tip-01613-g72662bb #168 [ 0.713231] Call Trace: [ 0.713997] [<c017174d>] lockdep_rcu_dereference+0x9d/0xb0 [ 0.714746] [<c015a117>] create_workqueue_thread+0x107/0x110 [ 0.715353] [<c015aee0>] ? worker_thread+0x0/0x340 [ 0.715845] [<c015a8e8>] __create_workqueue_key+0x138/0x240 [ 0.716427] [<c0142f92>] ? cpu_maps_update_done+0x12/0x20 [ 0.717012] [<c086b12f>] init_workqueues+0x6f/0x80 [ 0.717530] [<c08576d2>] kernel_init+0x102/0x1f0 [ 0.717570] [<c08575d0>] ? kernel_init+0x0/0x1f0 [ 0.718944] [<c01030fa>] kernel_thread_helper+0x6/0x10 Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> LKML-Reference: <4B9F48AD.4000404@xxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- include/linux/tracepoint.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index f59604e..78b4bd3 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -49,7 +49,7 @@ struct tracepoint { void **it_func; \ \ rcu_read_lock_sched_notrace(); \ - it_func = rcu_dereference((tp)->funcs); \ + it_func = rcu_dereference_sched((tp)->funcs); \ if (it_func) { \ do { \ ((void(*)(proto))(*it_func))(args); \ -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html