linux-kernel - [PATCH RESEND]mm/ia64: fix a node distance bug

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Message-ID: <50484E2C.1060107@gmail.com>
Date:	Thu, 06 Sep 2012 15:18:04 +0800
From:	wujianguo <wujianguo106@...il.com>
To:	tony.luck@...el.com, akpm@...ux-foundation.org,
	fenghua.yu@...el.com
CC:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jiang.liu@...wei.com, guohanjun@...wei.com,
	qiuxishi@...wei.com, wujianguo@...wei.com, wency@...fujitsu.com
Subject: [PATCH RESEND]mm/ia64: fix a node distance bug

From: Jianguo Wu <wujianguo@...wei.com>

In arch ia64, has following definition:
extern u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
#define node_distance(from,to) (numa_slit[(from) * num_online_nodes() + (to)])

num_online_nodes() is a variable value, it can be changed after hot-remove/add
a node.

I my practice, I found node distance is wrong after offline
a node in IA64 platform. For example system has 4 nodes:
node distances:
node   0   1   2   3
  0:  10  21  21  32
  1:  21  10  32  21
  2:  21  32  10  21
  3:  32  21  21  10

linux-drf:/sys/devices/system/node/node0 # cat distance
10  21  21  32
linux-drf:/sys/devices/system/node/node1 # cat distance
21  10  32  21

After offline node2:
linux-drf:/sys/devices/system/node/node0 # cat distance
10 21 32
linux-drf:/sys/devices/system/node/node1 # cat distance
32 21 32	--------->expected value is: 21  10  21


Signed-off-by: Jianguo Wu <wujianguo@...wei.com>
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 arch/ia64/include/asm/numa.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/ia64/include/asm/numa.h b/arch/ia64/include/asm/numa.h
index 6a8a27c..2e27ef1 100644
--- a/arch/ia64/include/asm/numa.h
+++ b/arch/ia64/include/asm/numa.h
@@ -59,7 +59,7 @@ extern struct node_cpuid_s node_cpuid[NR_CPUS];
  */

 extern u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
-#define node_distance(from,to) (numa_slit[(from) * num_online_nodes() + (to)])
+#define node_distance(from,to) (numa_slit[(from) * MAX_NUMNODES + (to)])

 extern int paddr_to_nid(unsigned long paddr);

-- 1.7.6.1 .
--
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