fix bogus hotplug cpu warning

Fix bogus DEBUG_PREEMPT warning on x86_64, when cpu brought online after
bootup: current_is_keventd is right to note its use of smp_processor_id
is preempt-safe, but should use raw_smp_processor_id to avoid the warning.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 58e5c15..e080d1d 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -635,7 +635,7 @@ int keventd_up(void)
 int current_is_keventd(void)
 {
        struct cpu_workqueue_struct *cwq;
-       int cpu = smp_processor_id();   /* preempt-safe: keventd is per-cpu */
+       int cpu = raw_smp_processor_id(); /* preempt-safe: keventd is per-cpu */
        int ret = 0;
 
        BUG_ON(!keventd_wq);