From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Brown <davidb@davidb.org>
Date: Wed, 22 Feb 2012 16:29:26 +0000
Subject: Re: [patch] Btrfs: silence a compiler warning
Message-Id: <20120222162926.GA25392@davidb.org>
List-Id: <kernel-janitors.vger.kernel.org>
References: <20120222073055.GB7389@elgon.mountain>
In-Reply-To: <20120222073055.GB7389@elgon.mountain>
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To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Chris Mason <chris.mason@oracle.com>, linux-btrfs@vger.kernel.org, kernel-janitors@vger.kernel.org

On Wed, Feb 22, 2012 at 10:30:55AM +0300, Dan Carpenter wrote:
>Gcc warns that "ret" can be used uninitialized.  It can't actually be
>used uninitialized because btrfs_num_copies() always returns 1 or more.
>
>Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
>diff --git a/fs/btrfs/check-integrity.c b/fs/btrfs/check-integrity.c
>index 064b29b..c053e90 100644
>--- a/fs/btrfs/check-integrity.c
>+++ b/fs/btrfs/check-integrity.c
>@@ -643,7 +643,7 @@ static struct btrfsic_dev_state *btrfsic_dev_state_hashtable_lookup(
> static int btrfsic_process_superblock(struct btrfsic_state *state,
> 				      struct btrfs_fs_devices *fs_devices)
> {
>-	int ret;
>+	int ret = 0;

Does

	int uninitialized_var(ret);

work?  The assignment to zero actually generates additional
(unnecessary) code.

David