This is a note to let you know that I've just added the patch titled gfs2: avoid uninitialized variable warning to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: gfs2-avoid-uninitialized-variable-warning.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 67893f12e5374bbcaaffbc6e570acbc2714ea884 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann <arnd@xxxxxxxx> Date: Tue, 26 Jan 2016 13:08:10 -0500 Subject: gfs2: avoid uninitialized variable warning From: Arnd Bergmann <arnd@xxxxxxxx> 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 <arnd@xxxxxxxx> Signed-off-by: Bob Peterson <rpeterso@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/gfs2/dir.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -760,7 +760,7 @@ static int get_first_leaf(struct gfs2_in 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; @@ -976,7 +976,7 @@ static int dir_split_leaf(struct inode * 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 */ Patches currently in stable-queue which might be from arnd@xxxxxxxx are queue-4.4/tty-nozomi-avoid-a-harmless-gcc-warning.patch queue-4.4/gfs2-avoid-uninitialized-variable-warning.patch queue-4.4/hostap-avoid-uninitialized-variable-use-in-hfa384x_get_rid.patch