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rcu: Fix up pending cbs check in rcu_prepare_for_idle

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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: 15fecf89e46a ("srcu: Abstract multi-tail callback list handling")
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Twisted <36546624+TwistedPrime@users.noreply.github.com>
Signed-off-by: Sorayukii <sorayukii69@gmail.com>
This commit is contained in:
Neeraj Upadhyay 2017-08-07 11:20:10 +05:30 • committed by Sorayukii
commit 3edb636b2e
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree_plugin.h
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@ -1511,7 +1511,7 @@ 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. */