mm: workingset: use cheaper __inc_lruvec_state in irqsafe node reclaim

No need to use the preemption-safe lruvec state function inside the
reclaim region that has irqs disabled.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Johannes Weiner <[e-mail]>
Reviewed-by: Andrew Morton <[e-mail]>
Reviewed-by: Rik van Riel <[e-mail]>
Acked-by: Peter Zijlstra (Intel) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/workingset.c

···
 	}
 	if (WARN_ON_ONCE(node->exceptional))
 		goto out_invalid;
-	inc_lruvec_page_state(virt_to_page(node), WORKINGSET_NODERECLAIM);
+	__inc_lruvec_page_state(virt_to_page(node), WORKINGSET_NODERECLAIM);
 	__radix_tree_delete_node(&mapping->i_pages, node,
 				 workingset_lookup_update(mapping));