Commit-ID: 39c8d313c3c546a414cc51b4f6571c2f8cc06407 Gitweb: http://git.kernel.org/tip/39c8d313c3c546a414cc51b4f6571c2f8cc06407 Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> AuthorDate: Tue, 20 Jan 2015 23:42:38 -0800 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Thu, 26 Feb 2015 12:01:30 -0800 rcu: Avoid clobbering early boot callbacks When a CPU comes online, it initializes its callback list. This is a bad thing if this is the first time that the CPU has come online and if that CPU has early boot callbacks. This commit therefore avoid initializing the callback list if there are callbacks present, in which case the initial call_rcu() did the initialization for us. Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> --- kernel/rcu/tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index fcfdbe5..92fd3ea 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3583,7 +3583,8 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp) rdp->qlen_last_fqs_check = 0; rdp->n_force_qs_snap = rsp->n_force_qs; rdp->blimit = blimit; - init_callback_list(rdp); /* Re-enable callbacks on this CPU. */ + if (!rdp->nxtlist) + init_callback_list(rdp); /* Re-enable callbacks on this CPU. */ rdp->dynticks->dynticks_nesting = DYNTICK_TASK_EXIT_IDLE; rcu_sysidle_init_percpu_data(rdp->dynticks); atomic_set(&rdp->dynticks->dynticks, -- 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
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