mm: zbud: fix condition check on allocation size
commit9d8c5b5284e4a0167c5f7b1193692492358b8700
authorHeesub Shin <heesub.shin@samsung.com>
Wed, 31 Jul 2013 20:53:40 +0000 (31 13:53 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 31 Jul 2013 21:41:03 +0000 (31 14:41 -0700)
treece4fa52666297238d217ce096f5fc6201bd08343
parente180cf806a93ea1abbce47b245d25204ff557ce9
mm: zbud: fix condition check on allocation size

zbud_alloc() incorrectly verifies the size of allocation limit.  It
should deny the allocation request greater than (PAGE_SIZE -
ZHDR_SIZE_ALIGNED - CHUNK_SIZE), not (PAGE_SIZE - ZHDR_SIZE_ALIGNED)
which has no remaining spaces for its buddy.  There is no point in
spending the entire zbud page storing only a single page, since we don't
have any benefits.

Signed-off-by: Heesub Shin <heesub.shin@samsung.com>
Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Cc: Bob Liu <bob.liu@oracle.com>
Cc: Dongjun Shin <d.j.shin@samsung.com>
Cc: Sunae Seo <sunae.seo@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/zbud.c