linux-kernel - Re: [PATCH] net/mlx5: fix -Wtype-limits compilation warnings

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Date:   Mon, 22 Jul 2019 12:42:54 -0700
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     David Miller <davem@...emloft.net>
Cc:     Qian Cai <cai@....pw>, Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/mlx5: fix -Wtype-limits compilation warnings

On Mon, Jul 22, 2019 at 12:09 PM David Miller <davem@...emloft.net> wrote:
>
> From: Qian Cai <cai@....pw>
> Date: Mon, 22 Jul 2019 14:34:42 -0400
>
> > The commit b9a7ba556207 ("net/mlx5: Use event mask based on device
> > capabilities") introduced a few compilation warnings due to it bumps
> > MLX5_EVENT_TYPE_MAX from 0x27 to 0x100 which is always greater than
> > an "struct {mlx5_eqe|mlx5_nb}.type" that is an "u8".
> >
> > drivers/net/ethernet/mellanox/mlx5/core/eq.c: In function
> > 'mlx5_eq_notifier_register':
> > drivers/net/ethernet/mellanox/mlx5/core/eq.c:948:21: warning: comparison
> > is always false due to limited range of data type [-Wtype-limits]
> >   if (nb->event_type >= MLX5_EVENT_TYPE_MAX)
> >                      ^~
> > drivers/net/ethernet/mellanox/mlx5/core/eq.c: In function
> > 'mlx5_eq_notifier_unregister':
> > drivers/net/ethernet/mellanox/mlx5/core/eq.c:959:21: warning: comparison
> > is always false due to limited range of data type [-Wtype-limits]
> >   if (nb->event_type >= MLX5_EVENT_TYPE_MAX)
> >
> > Fix them by removing unnecessary checkings.
> >
> > Fixes: b9a7ba556207 ("net/mlx5: Use event mask based on device capabilities")
> > Signed-off-by: Qian Cai <cai@....pw>
>
> Saeed, I am assuming that you will take this.

Yes, will take it.
The patch LGTM, though not applying it yet so others get the chance to
review it.
will apply it in a couple of days.

Thanks,
Saeed.