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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-05-04 21:43:49 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-05-07 22:50:45 -0700
commit1217ed1ba5c67393293dfb0f03c353b118dadeb4 (patch)
treea765356c8418e134de85fd05d9fe6eda41de859c /kernel/rcutree.h
parent29ce831000081dd757d3116bf774aafffc4b6b20 (diff)
downloadop-kernel-dev-1217ed1ba5c67393293dfb0f03c353b118dadeb4.zip
op-kernel-dev-1217ed1ba5c67393293dfb0f03c353b118dadeb4.tar.gz
rcu: permit rcu_read_unlock() to be called while holding runqueue locks
Avoid calling into the scheduler while holding core RCU locks. This allows rcu_read_unlock() to be called while holding the runqueue locks, but only as long as there was no chance of the RCU read-side critical section having been preempted. (Otherwise, if RCU priority boosting is enabled, rcu_read_unlock() might call into the scheduler in order to unboost itself, which might allows self-deadlock on the runqueue locks within the scheduler.) Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcutree.h')
-rw-r--r--kernel/rcutree.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index a6a9717..93d4a1c 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -444,15 +444,12 @@ static void rcu_preempt_send_cbs_to_online(void);
static void __init __rcu_init_preempt(void);
static void rcu_needs_cpu_flush(void);
static void __init rcu_init_boost_waitqueue(struct rcu_node *rnp);
-static void rcu_initiate_boost(struct rcu_node *rnp);
+static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp,
cpumask_var_t cm);
static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
struct rcu_node *rnp,
int rnp_index);
-#ifdef CONFIG_HOTPLUG_CPU
-static void rcu_stop_boost_kthread(struct rcu_node *rnp);
-#endif /* #ifdef CONFIG_HOTPLUG_CPU */
#endif /* #ifndef RCU_TREE_NONCORE */
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