linux-kernel - Re: [PATCH v2] xfs: avoid harmless gcc-7 warnings

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Date:   Thu, 11 May 2017 08:17:57 -0700
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-xfs@...r.kernel.org, Brian Foster <bfoster@...hat.com>,
        Eric Sandeen <sandeen@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] xfs: avoid harmless gcc-7 warnings

On Thu, May 11, 2017 at 05:04:33PM +0200, Arnd Bergmann wrote:
> gcc-7 flags the use of integer math inside of a condition
> as a potential bug:
> 
> fs/xfs/xfs_bmap_util.c: In function 'xfs_swap_extents_check_format':
> fs/xfs/xfs_bmap_util.c:1619:8: error: '<<' in boolean context, did you mean '<' ? [-Werror=int-in-bool-context]
> fs/xfs/xfs_bmap_util.c:1629:8: error: '<<' in boolean context, did you mean '<' ? [-Werror=int-in-bool-context]
> 
> There is already a helper function for testing the di_forkoff
> field for zero, so let's use that instead to shut up the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>

--D

> ---
>  fs/xfs/xfs_bmap_util.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index 2b954308a1d6..da4867567647 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -1613,7 +1613,7 @@ xfs_swap_extents_check_format(
>  	 * extent format...
>  	 */
>  	if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
> -		if (XFS_IFORK_BOFF(ip) &&
> +		if (XFS_IFORK_Q(ip) &&
>  		    XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip))
>  			return -EINVAL;
>  		if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <=
> @@ -1623,7 +1623,7 @@ xfs_swap_extents_check_format(
>  
>  	/* Reciprocal target->temp btree format checks */
>  	if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
> -		if (XFS_IFORK_BOFF(tip) &&
> +		if (XFS_IFORK_Q(tip) &&
>  		    XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip))
>  			return -EINVAL;
>  		if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <=
> -- 
> 2.9.0
> 
> --
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