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authorJulia Lawall <julia@diku.dk>2009-02-12 10:16:03 -0500
committerChris Mason <chris.mason@oracle.com>2009-02-12 10:16:03 -0500
commit3f3420df505e47751ef76a652b5cb660e5360d6f (patch)
treede413daa777dba47be638c29825c779635a45764
parenta48ddf08ba9bab91efd95e458737afa9d7699623 (diff)
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>
-rw-r--r--fs/btrfs/volumes.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index bcd14eb..c793b6f 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;