linux-kernel - [PATCH] fix bogus hotplug cpu warning

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Message-ID: <Pine.LNX.4.64.0708271604440.21853@blonde.wat.veritas.com>
Date:	Mon, 27 Aug 2007 16:06:19 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...itas.com>

--- 2.6.23-rc3-git10/kernel/workqueue.c	2007-07-26 19:49:58.000000000 +0100
+++ linux/kernel/workqueue.c	2007-08-26 18:59:16.000000000 +0100
@@ -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);
-
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