tree d0f4a4a835754286ec9e2b940e950b2b68a4f61b
parent 092cead6175bb1b3d3078a34ba71c939d526c70b
author Mel Gorman <mel@csn.ul.ie> 1245191538 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1245206856 -0700

page allocator: sanity check order in the page allocator slow path

Callers may speculatively call different allocators in order of preference
trying to allocate a buffer of a given size.  The order needed to allocate
this may be larger than what the page allocator can normally handle.
While the allocator mostly does the right thing, it should not direct
reclaim or wakeup kswapd with a bogus order.  This patch sanity checks the
order in the slow path and returns NULL if it is too large.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>