netdev - Re: [PATCH] net/mlx4: suppress 'may be used uninitialized' warning

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Message-ID: <20170418070219.GA14088@mtr-leonro.local>
Date:   Tue, 18 Apr 2017 10:02:19 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Greg Thelen <gthelen@...gle.com>
Cc:     Or Gerlitz <ogerlitz@...lanox.com>,
        Jack Morgenstein <jackm@....mellanox.co.il>,
        Matan Barak <matanb@...lanox.com>,
        Ido Shamay <idos@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Amir Vadai <amirv@...lanox.com>,
        Roland Dreier <roland@...estorage.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [PATCH] net/mlx4: suppress 'may be used uninitialized' warning

On Mon, Apr 17, 2017 at 11:21:35PM -0700, Greg Thelen wrote:
> gcc 4.8.4 complains that mlx4_SW2HW_MPT_wrapper() uses an uninitialized
> 'mpt' variable:
>   drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'mlx4_SW2HW_MPT_wrapper':
>   drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:2802:12: warning: 'mpt' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      mpt->mtt = mtt;
>
> I think this warning is a false complaint.  mpt is only used when
> mr_res_start_move_to() return zero, and in all such cases it initializes
> mpt.
> But apparently gcc cannot see that.
>
> Initialize mpt to avoid the warning.
>
> Signed-off-by: Greg Thelen <gthelen@...gle.com>
> ---

It looks like other callers of mr_res_start_move_to() have the same
"uninitialized" variable.

Thanks

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