The patch titled
Subject: mm/ia64: fix a node distance bug
has been removed from the -mm tree. Its filename was
mm-ia64-fix-a-node-distance-bug.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Jianguo Wu <wujianguo@xxxxxxxxxx>
Subject: mm/ia64: fix a node distance bug
ia64 has the 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@xxxxxxxxxx>
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/ia64/include/asm/numa.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/ia64/include/asm/numa.h~mm-ia64-fix-a-node-distance-bug arch/ia64/include/asm/numa.h
--- a/arch/ia64/include/asm/numa.h~mm-ia64-fix-a-node-distance-bug
+++ a/arch/ia64/include/asm/numa.h
@@ -59,7 +59,7 @@ extern struct node_cpuid_s node_cpuid[NR
*/
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);
_
Patches currently in -mm which might be from wujianguo@xxxxxxxxxx are
mm-ia64-fix-a-memory-block-size-bug.patch
linux-next.patch
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