diff options
| -rw-r--r-- | kernel/rcu/tree_exp.h | 62 |
1 files changed, 29 insertions, 33 deletions
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 6d86ab6ec2c9..1549f456fb7b 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -516,6 +516,33 @@ static void rcu_exp_wait_wake(struct rcu_state *rsp, unsigned long s) mutex_unlock(&rsp->exp_wake_mutex); } +/* + * Given an rcu_state pointer and a smp_call_function() handler, kick + * off the specified flavor of expedited grace period. + */ +static void _synchronize_rcu_expedited(struct rcu_state *rsp, + smp_call_func_t func) +{ + unsigned long s; + + /* If expedited grace periods are prohibited, fall back to normal. */ + if (rcu_gp_is_normal()) { + wait_rcu_gp(rsp->call); + return; + } + + /* Take a snapshot of the sequence number. */ + s = rcu_exp_gp_seq_snap(rsp); + if (exp_funnel_lock(rsp, s)) + return; /* Someone else did our work for us. */ + + /* Initialize the rcu_node tree in preparation for the wait. */ + sync_rcu_exp_select_cpus(rsp, func); + + /* Wait and clean up, including waking everyone. */ + rcu_exp_wait_wake(rsp, s); +} + /** * synchronize_sched_expedited - Brute-force RCU-sched grace period * @@ -534,29 +561,13 @@ static void rcu_exp_wait_wake(struct rcu_state *rsp, unsigned long s) */ void synchronize_sched_expedited(void) { - unsigned long s; struct rcu_state *rsp = &rcu_sched_state; /* If only one CPU, this is automatically a grace period. */ if (rcu_blocking_is_gp()) return; - /* If expedited grace periods are prohibited, fall back to normal. */ - if (rcu_gp_is_normal()) { - wait_rcu_gp(call_rcu_sched); - return; - } - - /* Take a snapshot of the sequence number. */ - s = rcu_exp_gp_seq_snap(rsp); - if (exp_funnel_lock(rsp, s)) - return; /* Someone else did our work for us. */ - - /* Initialize the rcu_node tree in preparation for the wait. */ - sync_rcu_exp_select_cpus(rsp, sync_sched_exp_handler); - - /* Wait and clean up, including waking everyone. */ - rcu_exp_wait_wake(rsp, s); + _synchronize_rcu_expedited(rsp, sync_sched_exp_handler); } EXPORT_SYMBOL_GPL(synchronize_sched_expedited); @@ -620,23 +631,8 @@ static void sync_rcu_exp_handler(void *info) void synchronize_rcu_expedited(void) { struct rcu_state *rsp = rcu_state_p; - unsigned long s; - /* If expedited grace periods are prohibited, fall back to normal. */ - if (rcu_gp_is_normal()) { - wait_rcu_gp(call_rcu); - return; - } - - s = rcu_exp_gp_seq_snap(rsp); - if (exp_funnel_lock(rsp, s)) - return; /* Someone else did our work for us. */ - - /* Initialize the rcu_node tree in preparation for the wait. */ - sync_rcu_exp_select_cpus(rsp, sync_rcu_exp_handler); - - /* Wait for ->blkd_tasks lists to drain, then wake everyone up. */ - rcu_exp_wait_wake(rsp, s); + _synchronize_rcu_expedited(rsp, sync_rcu_exp_handler); } EXPORT_SYMBOL_GPL(synchronize_rcu_expedited); |