linux-kernel - Re: [PATCH v1] mlx4: remove unused fields

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Date:   Wed, 28 Sep 2016 11:19:07 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Decotigny <ddecotig@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>
Cc:     Yishai Hadas <yishaih@...lanox.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        edumazet@...gle.com, David Decotigny <decot@...glers.com>
Subject: Re: [PATCH v1] mlx4: remove unused fields

On Wed, 2016-09-28 at 11:00 -0700, David Decotigny wrote:
> From: David Decotigny <decot@...glers.com>
> 
> This also can address following UBSAN warnings:
> [   36.640343] ================================================================================
> [   36.648772] UBSAN: Undefined behaviour in drivers/net/ethernet/mellanox/mlx4/fw.c:857:26
> [   36.656853] shift exponent 64 is too large for 32-bit type 'int'
> [   36.663348] ================================================================================
> [   36.671783] ================================================================================
> [   36.680213] UBSAN: Undefined behaviour in drivers/net/ethernet/mellanox/mlx4/fw.c:861:27
> [   36.688297] shift exponent 35 is too large for 32-bit type 'int'
> [   36.694702] ================================================================================
> 
> Tested:
>   reboot with UBSAN, no warning.
> 
> Signed-off-by: David Decotigny <decot@...glers.com>
> ---

CC: Tariq Toukan <tariqt@...lanox.com> (mlx4 maintainer)

Note this patch was cooked/tested using net-next, but can be applied to
net tree, with minor fuzz.

Acked-by: Eric Dumazet <edumazet@...gle.com>

Thanks David.