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

David Miller
2017-04-20T17:19:49Z

From: Greg Thelen <gthelen-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Date: Mon, 17 Apr 2017 23:21:35 -0700

> 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-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>

Appied to net-next.
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