linux-kernel - [PATCH] x86,percpu: fix inverted NUMA test in setup_pcpu

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Date:	Wed, 01 Apr 2009 15:06:33 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86,percpu: fix inverted NUMA test in setup_pcpu_remap()

setup_percpu_remap() is for NUMA machines yet it bailed out with
-EINVAL if pcpu_need_numa().  Fix the inverted condition.

This problem was reported by David Miller and verified by Yinhai Lu.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: David Miller <davem@...emloft.net>
Reported-by: Yinghai Lu <yinghai@...nel.org>
---
Oops, thanks for spotting it.  I don't have a numa machine so the
condition was never tested on actual machines.  :-)

 arch/x86/kernel/setup_percpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index 400331b..876b127 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -162,7 +162,7 @@ static ssize_t __init setup_pcpu_remap(size_t static_size)
 	 * If large page isn't supported, there's no benefit in doing
 	 * this.  Also, on non-NUMA, embedding is better.
 	 */
-	if (!cpu_has_pse || pcpu_need_numa())
+	if (!cpu_has_pse || !pcpu_need_numa())
 		return -EINVAL;
 
 	last = NULL;
--
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