workqueue: Work around edge cases for calc of pool's cpumask

[linux-2.6-block.git] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 7146ea70a62d124295feb36b9c3631279fffd365..ca937b0c3a968f247a227d68812c9062fb4916c5 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3577,6 +3577,13 @@ static bool wq_calc_node_cpumask(const struct workqueue_attrs *attrs, int node,
 
        /* yeap, return possible CPUs in @node that @attrs wants */
        cpumask_and(cpumask, attrs->cpumask, wq_numa_possible_cpumask[node]);
+
+       if (cpumask_empty(cpumask)) {
+               pr_warn_once("WARNING: workqueue cpumask: online intersect > "
+                               "possible intersect\n");
+               return false;
+       }
+
        return !cpumask_equal(cpumask, attrs->cpumask);
 
 use_dfl: