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Subject[PATCH wq#for-linus] workqueue: workqueue_cpu_callback() should be cpu_notifier not hotcpu_notifier
Commit 6ee0578b (workqueue: mark init_workqueues as early_initcall)
made workqueue SMP initialization depend on workqueue_cpu_callback(),
which however was registered as hotcpu_notifier() and didn't get
called if CONFIG_HOTPLUG_CPU is not set. This made gcwqs on non-boot
CPUs not create their initial workers leading to boot failures. Fix
it by making it a cpu_notifier.

Signed-off-by: Tejun Heo <>
Reported-and-bisected-by: walt <>
So, something like this. Can you please verify the fix?


kernel/workqueue.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index da6c482..2994a0e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3527,7 +3527,7 @@ static int __init init_workqueues(void)
unsigned int cpu;
int i;

- hotcpu_notifier(workqueue_cpu_callback, CPU_PRI_WORKQUEUE);
+ cpu_notifier(workqueue_cpu_callback, CPU_PRI_WORKQUEUE);

/* initialize gcwqs */
for_each_gcwq_cpu(cpu) {

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