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| author | Julia Lawall <julia@diku.dk> | 2009-02-12 10:16:03 -0500 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-02-12 10:16:03 -0500 |
| commit | 3f3420df505e47751ef76a652b5cb660e5360d6f (patch) | |
| tree | de413daa777dba47be638c29825c779635a45764 /fs/btrfs | |
| parent | a48ddf08ba9bab91efd95e458737afa9d7699623 (diff) | |
| download | linux-3f3420df505e47751ef76a652b5cb660e5360d6f.tar.gz linux-3f3420df505e47751ef76a652b5cb660e5360d6f.tar.bz2 linux-3f3420df505e47751ef76a652b5cb660e5360d6f.zip | |
Btrfs: fs/btrfs/volumes.c: remove useless kzalloc
The call to kzalloc is followed by a kmalloc whose result is stored in the
same variable.
The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,l;
position p1,p2;
expression *ptr != NULL;
@@
(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
)
<... when != x
when != if (...) { <+...x...+> }
x->f = E
...>
(
return \(0\|<+...x...+>\|ptr\);
|
return@p2 ...;
)
@script:python@
p1 << r.p1;
p2 << r.p2;
@@
print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/volumes.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index bcd14ebccae1..c793b6f50d8d 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2894,10 +2894,6 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, free_extent_map(em); } - map = kzalloc(sizeof(*map), GFP_NOFS); - if (!map) - return -ENOMEM; - em = alloc_extent_map(GFP_NOFS); if (!em) return -ENOMEM; |