linux-kernel - [PATCH] x86, numa: exit early on numa_reset

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Date:	Wed, 16 Feb 2011 12:56:47 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	Tejun Heo <tj@...nel.org>, David Rientjes <rientjes@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, numa: exit early on numa_reset_distance()


Do not call __pa(numa_distance), if it is not allocated before.

it will get BUG_ON if VIRTUAL_DEBUG is on.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/mm/numa_64.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-2.6/arch/x86/mm/numa_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/numa_64.c
+++ linux-2.6/arch/x86/mm/numa_64.c
@@ -371,6 +371,12 @@ static void __init numa_reset_distance(v
 {
 	size_t size;
 
+	if (!numa_distance_cnt) {
+		numa_distance = NULL;
+
+		return;
+	}
+
 	size = numa_distance_cnt * sizeof(numa_distance[0]);
 	memblock_x86_free_range(__pa(numa_distance),
 				__pa(numa_distance) + size);
--
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