tree 7f6e56b3fc5a721296851448e3facf821ef543dd
parent 3560e249abda6bee41a07a7bf0383a6e193e2839
author Timur Tabi <timur@freescale.com> 1216873691 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1216921640 -0700

mm: add alloc_pages_exact() and free_pages_exact()

alloc_pages_exact() is similar to alloc_pages(), except that it allocates
the minimum number of pages to fulfill the request.  This is useful if you
want to allocate a very large buffer that is slightly larger than an even
power-of-two number of pages.  In that case, alloc_pages() will waste a
lot of memory.

I have a video driver that wants to allocate a 5MB buffer.  alloc_pages()
wiill waste 3MB of physically-contiguous memory.

Signed-off-by: Timur Tabi <timur@freescale.com>
Cc: Andi Kleen <andi@firstfloor.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>