Patch "rcu: Fix up pending cbs check in rcu_prepare_for_idle" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

rcu: Fix up pending cbs check in rcu_prepare_for_idle

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
rcu-fix-up-pending-cbs-check-in-rcu_prepare_for_idle.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Neeraj Upadhyay <[email protected]>
Date: Mon, 7 Aug 2017 11:20:10 +0530
Subject: rcu: Fix up pending cbs check in rcu_prepare_for_idle

From: Neeraj Upadhyay <[email protected]>

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.

---
 kernel/rcu/tree_plugin.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -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. */

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/rcu-fix-up-pending-cbs-check-in-rcu_prepare_for_idle.patch