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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-30 13:01:35 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-30 13:01:35 -0400
commit70c8a00a09076ca2683ef24356fad2e55f93a427 (patch)
treea54329b865a15e29364be31c6567f37807c4c3bb /kernel
parentb9a532277938798b53178d5a66af6e2915cb27cf (diff)
parent7c4f1c694bf84eac538bee3e411aed10ae617d46 (diff)
Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU fixes from Ingo Molnar: "Two RCU fixes: - work around bug with recent GCC versions. - fix false positive lockdep splat" * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rcu: Suppress lockdep false positive for rcp->exp_funnel_mutex rcu: Change _wait_rcu_gp() to work around GCC bug 67055
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcu/tree.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9f75f25cc5d9..775d36cc0050 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3868,6 +3868,7 @@ static void rcu_init_new_rnp(struct rcu_node *rnp_leaf)
static void __init
rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
{
+ static struct lock_class_key rcu_exp_sched_rdp_class;
unsigned long flags;
struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu);
struct rcu_node *rnp = rcu_get_root(rsp);
@@ -3883,6 +3884,10 @@ rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp)
mutex_init(&rdp->exp_funnel_mutex);
rcu_boot_init_nocb_percpu_data(rdp);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
+ if (rsp == &rcu_sched_state)
+ lockdep_set_class_and_name(&rdp->exp_funnel_mutex,
+ &rcu_exp_sched_rdp_class,
+ "rcu_data_exp_sched");
}
/*