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| author | David Rientjes <rientjes@google.com> | 2011-05-24 17:12:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:29 -0700 |
| commit | a197b59ae6e8bee56fcef37ea2482dc08414e2ac (patch) | |
| tree | ead0890373cc9c36321364efbad73a25898076ab /Documentation/credentials.txt | |
| parent | ba93fa81b5f2bf0076407a3a777fff122ce16220 (diff) | |
| download | linux-a197b59ae6e8bee56fcef37ea2482dc08414e2ac.tar.gz linux-a197b59ae6e8bee56fcef37ea2482dc08414e2ac.tar.bz2 linux-a197b59ae6e8bee56fcef37ea2482dc08414e2ac.zip | |
mm: fail GFP_DMA allocations when ZONE_DMA is not configured
The page allocator will improperly return a page from ZONE_NORMAL even
when __GFP_DMA is passed if CONFIG_ZONE_DMA is disabled. The caller
expects DMA memory, perhaps for ISA devices with 16-bit address registers,
and may get higher memory resulting in undefined behavior.
This patch causes the page allocator to return NULL in such circumstances
with a warning emitted to the kernel log on the first occurrence.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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>
Diffstat (limited to 'Documentation/credentials.txt')
0 files changed, 0 insertions, 0 deletions