Messages in this thread Patch in this message | | | Date | Thu, 06 Sep 2012 15:18:04 +0800 | From | wujianguo <> | Subject | [PATCH RESEND]mm/ia64: fix a node distance bug |
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From: Jianguo Wu <wujianguo@huawei.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@huawei.com> Signed-off-by: Jiang Liu <jiang.liu@huawei.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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