Re: [GIT PULL] workqueue fixes for v4.13-rc3

[Tejun Heo]

Hello,

On Mon, Aug 07, 2017 at 02:18:51PM +0200, Geert Uytterhoeven wrote:
> This triggers on m68k, which doesn't have SMP.
> Haven't tried it yet on any other system due to holidays.

That's weird.  Can you please apply the following patch and report the
messages?

Thanks.

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ca937b0..1b9d21b 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3579,8 +3579,10 @@ static bool wq_calc_node_cpumask(const struct 
workqueue_attrs *attrs, int node,
        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");
+               pr_warn_once("WARNING: workqueue empty cpumask: node=%d 
cpu_going_down=%d cpumask=%*pb online=%*pb possible=%*pb\n",
+                            node, cpu_going_down, 
cpumask_pr_args(attrs->cpumask),
+                            cpumask_pr_args(cpumask_of_node(node)),
+                            cpumask_pr_args(wq_numa_possible_cpumask[node]));
                return false;
        }
 
@@ -5526,6 +5528,9 @@ static void __init wq_numa_init(void)
 
        wq_numa_possible_cpumask = tbl;
        wq_numa_enabled = true;
+
+       for_each_node(node)
+               printk("XXX wq node[%d] %*pb\n", node, 
cpumask_pr_args(wq_numa_possible_cpumask[node]));
 }
 
 /**