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Subject[RFC Patch V1 09/30] mm, memcg: Use cpu_to_mem()/numa_mem_id() to support memoryless node
Date
When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
may return a node without memory, and later cause system failure/panic
when calling kmalloc_node() and friends with returned node id.
So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
memory for the/current cpu.

If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
is the same as cpu_to_node()/numa_node_id().

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a2c7bcb0e6eb..d6c4b7255ca9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1933,7 +1933,7 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg)
* we use curret node.
*/
if (unlikely(node == MAX_NUMNODES))
- node = numa_node_id();
+ node = numa_mem_id();

memcg->last_scanned_node = node;
return node;
--
1.7.10.4


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