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| author | David Rientjes <rientjes@google.com> | 2012-01-10 15:07:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-10 16:30:43 -0800 |
| commit | f6d7e0cb3ecc248e98fa11d83253f6174bd7e085 (patch) | |
| tree | 0925b5b584c8ed6718a54e6e56202686fb5b9468 | |
| parent | ad8a1b558e6c76fb53901956d3c8f29b82a4ccfa (diff) | |
| download | linux-f6d7e0cb3ecc248e98fa11d83253f6174bd7e085.tar.bz2 | |
mm, debug: test for online nid when allocating on single node
Calling alloc_pages_exact_node() means the allocation only passes the
zonelist of a single node into the page allocator. If that node isn't
online, it's zonelist may never have been initialized causing a strange
oops that may not immediately be clear.
I recently debugged an issue where node 0 wasn't online and an allocator
was passing 0 to alloc_pages_exact_node() and it resulted in a NULL
pointer on zonelist->_zoneref. If CONFIG_DEBUG_VM is enabled, though, it
would be nice to catch this a bit earlier.
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/gfp.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 91812df1351a..66f172fdf5fe 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -313,7 +313,7 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, unsigned int order) { - VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); + VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid)); return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); } |