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| author | David Rientjes | 2012-01-11 00:07:38 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2012-01-11 01:30:43 +0100 |
| commit | f6d7e0cb3ecc248e98fa11d83253f6174bd7e085 (patch) | |
| tree | 0925b5b584c8ed6718a54e6e56202686fb5b9468 /mm/vmscan.c | |
| parent | fadvise: only initiate writeback for specified range with FADV_DONTNEED (diff) | |
| download | kernel-qcow2-linux-f6d7e0cb3ecc248e98fa11d83253f6174bd7e085.tar.gz kernel-qcow2-linux-f6d7e0cb3ecc248e98fa11d83253f6174bd7e085.tar.xz kernel-qcow2-linux-f6d7e0cb3ecc248e98fa11d83253f6174bd7e085.zip | |
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>
Diffstat (limited to 'mm/vmscan.c')
0 files changed, 0 insertions, 0 deletions