mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
rcu: Use RCU's online-CPU state for expedited IPI retry
This commit improves the accuracy of the interaction between CPU hotplug operations and RCU's expedited grace periods by using RCU's online-CPU state to determine when failed IPIs should be retried. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
parent
98834b8378
commit
385c859f67
1 changed files with 5 additions and 6 deletions
|
@ -385,17 +385,16 @@ static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
|
|||
mask_ofl_ipi &= ~mask;
|
||||
continue;
|
||||
}
|
||||
/* Failed, raced with offline. */
|
||||
/* Failed, raced with CPU hotplug operation. */
|
||||
raw_spin_lock_irqsave_rcu_node(rnp, flags);
|
||||
if (cpu_online(cpu) &&
|
||||
if ((rnp->qsmaskinitnext & mask) &&
|
||||
(rnp->expmask & mask)) {
|
||||
/* Online, so delay for a bit and try again. */
|
||||
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
|
||||
schedule_timeout_uninterruptible(1);
|
||||
if (cpu_online(cpu) &&
|
||||
(rnp->expmask & mask))
|
||||
goto retry_ipi;
|
||||
raw_spin_lock_irqsave_rcu_node(rnp, flags);
|
||||
goto retry_ipi;
|
||||
}
|
||||
/* CPU really is offline, so we can ignore it. */
|
||||
if (!(rnp->expmask & mask))
|
||||
mask_ofl_ipi &= ~mask;
|
||||
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
|
||||
|
|
Loading…
Reference in a new issue