Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3594216f authored by Neeraj Upadhyay's avatar Neeraj Upadhyay Committed by Greg Kroah-Hartman
Browse files

rcu: Fix up pending cbs check in rcu_prepare_for_idle 



commit 135bd1a230bb69a68c9808a7d25467318900b80a upstream.

The pending-callbacks check in rcu_prepare_for_idle() is backwards.
It should accelerate if there are pending callbacks, but the check
rather uselessly accelerates only if there are no callbacks.  This commit
therefore inverts this check.

Fixes: 15fecf89 ("srcu: Abstract multi-tail callback list handling")
Signed-off-by: default avatarNeeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a371abb2

kernel/rcu/tree_plugin.h

+1 −1
Original line number Diff line number Diff line
@@ -1507,7 +1507,7 @@ static void rcu_prepare_for_idle(void) 
	rdtp->last_accelerate = jiffies;

	for_each_rcu_flavor(rsp) {

		rdp = this_cpu_ptr(rsp->rda);

		if (rcu_segcblist_pend_cbs(&rdp->cblist))

		if (!rcu_segcblist_pend_cbs(&rdp->cblist))

			continue;

		rnp = rdp->mynode;

		raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */