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| author | Heesub Shin <heesub.shin@samsung.com> | 2013-07-31 13:53:40 -0700 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:47:19 +0900 |
| commit | c81b00e74776b98feb94b984b3ea42a2f3d0f3da (patch) | |
| tree | 4c6140f5bee31f38d18d16c24bf06c11391fe1b5 /mm | |
| parent | 6e19d46a034c6310385cd60843d83aa74f4402e0 (diff) | |
| download | linux-3.10-c81b00e74776b98feb94b984b3ea42a2f3d0f3da.tar.gz linux-3.10-c81b00e74776b98feb94b984b3ea42a2f3d0f3da.tar.bz2 linux-3.10-c81b00e74776b98feb94b984b3ea42a2f3d0f3da.zip | |
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.
Change-Id: Ief305088b6983c01426300a0638520f51b17ad2a
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/zbud.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/zbud.c b/mm/zbud.c index 9bb4710e358..ad1e781284f 100644 --- a/mm/zbud.c +++ b/mm/zbud.c @@ -257,7 +257,7 @@ int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp, if (size <= 0 || gfp & __GFP_HIGHMEM) return -EINVAL; - if (size > PAGE_SIZE - ZHDR_SIZE_ALIGNED) + if (size > PAGE_SIZE - ZHDR_SIZE_ALIGNED - CHUNK_SIZE) return -ENOSPC; chunks = size_to_chunks(size); spin_lock(&pool->lock); |