From: Arnd Bergmann Date: Tue, 26 Jan 2016 18:08:10 +0000 (-0500) Subject: gfs2: avoid uninitialized variable warning X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=19bbc9f1bd1f32a7575a2f091f9178659b639071;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git gfs2: avoid uninitialized variable warning commit 67893f12e5374bbcaaffbc6e570acbc2714ea884 upstream. We get a bogus warning about a potential uninitialized variable use in gfs2, because the compiler does not figure out that we never use the leaf number if get_leaf_nr() returns an error: fs/gfs2/dir.c: In function 'get_first_leaf': fs/gfs2/dir.c:802:9: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized] fs/gfs2/dir.c: In function 'dir_split_leaf': fs/gfs2/dir.c:1021:8: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized] Changing the 'if (!error)' to 'if (!IS_ERR_VALUE(error))' is sufficient to let gcc understand that this is exactly the same condition as in IS_ERR() so it can optimize the code path enough to understand it. Signed-off-by: Arnd Bergmann Signed-off-by: Bob Peterson Signed-off-by: Willy Tarreau --- diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index b631c904346..9aaa6db3e4b 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -763,7 +763,7 @@ static int get_first_leaf(struct gfs2_inode *dip, u32 index, int error; error = get_leaf_nr(dip, index, &leaf_no); - if (!error) + if (!IS_ERR_VALUE(error)) error = get_leaf(dip, leaf_no, bh_out); return error; @@ -974,7 +974,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name) index = name->hash >> (32 - dip->i_depth); error = get_leaf_nr(dip, index, &leaf_no); - if (error) + if (IS_ERR_VALUE(error)) return error; /* Get the old leaf block */