linux-kernel - [PATCH 1/4] make dev_to

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Message-id: <200802200032.04915.yinghai.lu@sun.com>
Date:	Wed, 20 Feb 2008 00:32:04 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Greg KH <greg@...ah.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] make dev_to_node return online node



some numa system ( with multi HT chains) may return node without ram. aka it
is not online.
try to get one online node.

Signed-off-by: Yinghai Lu <yinghai.lu@....com>

diff --git a/include/linux/device.h b/include/linux/device.h
index 2258d89..7f1a4d7 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -478,7 +478,12 @@ struct device {
 #ifdef CONFIG_NUMA
 static inline int dev_to_node(struct device *dev)
 {
-	return dev->numa_node;
+	int node;
+	node = dev->numa_node;
+
+	if (node != -1 && !node_online(node))
+		node = numa_node_id();
+	return node;
 }
 static inline void set_dev_node(struct device *dev, int node)
 {
--
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