Messages in this thread Patch in this message |  | | Date | Sun, 2 Aug 2009 19:40:56 GMT | From | "tip-bot for Paul E. McKenney" <> | Subject | [tip:core/rcu] rcu: Add diagnostic check for a possible CPU-hotplug race |
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Commit-ID: 7256cf0e83bf018be8a81806593aaef7f2437f0b Gitweb: http://git.kernel.org/tip/7256cf0e83bf018be8a81806593aaef7f2437f0b Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> AuthorDate: Sun, 2 Aug 2009 10:21:10 -0700 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Sun, 2 Aug 2009 21:31:28 +0200
rcu: Add diagnostic check for a possible CPU-hotplug race
Complain if the RCU softirq code ever runs on a CPU that has not yet been announced to RCU as being online.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
--- kernel/rcutree.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 3313244..b9b1928 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -1132,6 +1132,8 @@ __rcu_process_callbacks(struct rcu_state *rsp, struct rcu_data *rdp) { unsigned long flags; + WARN_ON_ONCE(rdp->beenonline == 0); + /* * If an RCU GP has gone long enough, go check for dyntick * idle CPUs and, if needed, send resched IPIs.
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