netdev - RE: [net-next 1/8] net/mlx5: Fixed static checker warnings

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Date:   Wed, 1 Feb 2017 11:17:23 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Saeed Mahameed' <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Matan Barak <matanb@...lanox.com>
Subject: RE: [net-next 1/8] net/mlx5: Fixed static checker warnings

From: Saeed Mahameed
> Sent: 31 January 2017 20:59
> From: Or Gerlitz <ogerlitz@...lanox.com>
> 
> For some reason, sparse doesn't like using an expression of type (!x)
> with a bitwise | and &.  In order to mitigate that, we use a local
> variable.
> 
> Since getting a typeof(bitfield) is incorrect, we cast such cases.
...
> +			MLX5_SET(fte_match_set_lyr_2_4, headers_c, first_prio, (u8)mask->vlan_priority);

Ugg nasty casts...
...
>  #define MLX5_SET(typ, p, fld, v) do { \
> +	typeof(v) _v = v; \
..

Why not just 'unsigned int _v = v;

	David