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-rw-r--r--kernel/workqueue.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 740c5ab..f869aff 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -428,22 +428,34 @@ int schedule_delayed_work_on(int cpu,
return ret;
}
-int schedule_on_each_cpu(void (*func) (void *info), void *info)
+/**
+ * schedule_on_each_cpu - call a function on each online CPU from keventd
+ * @func: the function to call
+ * @info: a pointer to pass to func()
+ *
+ * Returns zero on success.
+ * Returns -ve errno on failure.
+ *
+ * Appears to be racy against CPU hotplug.
+ *
+ * schedule_on_each_cpu() is very slow.
+ */
+int schedule_on_each_cpu(void (*func)(void *info), void *info)
{
int cpu;
- struct work_struct *work;
+ struct work_struct *works;
- work = kmalloc(NR_CPUS * sizeof(struct work_struct), GFP_KERNEL);
-
- if (!work)
+ works = alloc_percpu(struct work_struct);
+ if (!works)
return -ENOMEM;
+
for_each_online_cpu(cpu) {
- INIT_WORK(work + cpu, func, info);
+ INIT_WORK(per_cpu_ptr(works, cpu), func, info);
__queue_work(per_cpu_ptr(keventd_wq->cpu_wq, cpu),
- work + cpu);
+ per_cpu_ptr(works, cpu));
}
flush_workqueue(keventd_wq);
- kfree(work);
+ free_percpu(works);
return 0;
}