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numa: fix slab_node(MPOL_BIND)

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When a node contains only HighMem memory, slab_node(MPOL_BIND)
dereferences a NULL pointer.

[ This code seems to go back all the way to commit 19770b3260: "mm:
  filter based on a nodemask as well as a gfp_mask".  Which was back in
  April 2008, and it got merged into 2.6.26.  - Linus ]

Signed-off-by: Eric Dumazet <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Lee Schermerhorn <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: [email protected]
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2010-10-27 19:33:43 +02:00 • committed by Linus Torvalds
commit 800416f799
1 changed files with 1 additions and 1 deletions
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2
mm/mempolicy.c
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@ -1597,7 +1597,7 @@ unsigned slab_node(struct mempolicy *policy)
(void)first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes,
&zone);
return zone->node;
return zone ? zone->node : numa_node_id();
}
default: