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mm, oom: ensure memoryless node zonelist always includes zones

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With memoryless node support being worked on, it's possible that for
optimizations that a node may not have a non-NULL zonelist.  When
CONFIG_NUMA is enabled and node 0 is memoryless, this means the zonelist
for first_online_node may become NULL.

The oom killer requires a zonelist that includes all memory zones for
the sysrq trigger and pagefault out of memory handler.

Ensure that a non-NULL zonelist is always passed to the oom killer.

[akpm@linux-foundation.org: fix non-numa build]
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes
2014-08-06 16:07:50 -07:00
committed by Linus Torvalds
parent 6e90b58be7
commit 8d060bf490
3 changed files with 12 additions and 3 deletions
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11
include/linux/nodemask.h
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@@ -430,7 +430,15 @@ static inline int num_node_state(enum node_states state)
for_each_node_mask((__node), node_states[__state])
#define first_online_node first_node(node_states[N_ONLINE])
#define next_online_node(nid) next_node((nid), node_states[N_ONLINE])
#define first_memory_node first_node(node_states[N_MEMORY])
static inline int next_online_node(int nid)
{
return next_node(nid, node_states[N_ONLINE]);
}
static inline int next_memory_node(int nid)
{
return next_node(nid, node_states[N_MEMORY]);
}
extern int nr_node_ids;
extern int nr_online_nodes;
@@ -471,6 +479,7 @@ static inline int num_node_state(enum node_states state)
for ( (node) = 0; (node) == 0; (node) = 1)
#define first_online_node 0
#define first_memory_node 0
#define next_online_node(nid) (MAX_NUMNODES)
#define nr_node_ids 1
#define nr_online_nodes 1