netdev - Re: [PATCH 4/7] net/mlx5: drop unnecessary list

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Date:   Tue, 28 Jul 2020 07:53:08 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "davem@...emloft.net" <davem@...emloft.net>,
        "Julia.Lawall@...ia.fr" <Julia.Lawall@...ia.fr>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] net/mlx5: drop unnecessary list_empty

On Mon, 2020-07-27 at 10:10 -0700, David Miller wrote:
> From: Julia Lawall <Julia.Lawall@...ia.fr>
> Date: Sun, 26 Jul 2020 12:58:29 +0200
> 
> > list_for_each_entry is able to handle an empty list.
> > The only effect of avoiding the loop is not initializing the
> > index variable.
> > Drop list_empty tests in cases where these variables are not
> > used.
> > 
> > Note that list_for_each_entry is defined in terms of
> list_first_entry,
> > which indicates that it should not be used on an empty list.  But
> in
> > list_for_each_entry, the element obtained by list_first_entry is
> not
> > really accessed, only the address of its list_head field is
> compared
> > to the address of the list head, so the list_first_entry is safe.
> > 
> > The semantic patch that makes this change is as follows (with
> another
> > variant for the no brace case): (http://coccinelle.lip6.fr/)
>  ...
> > Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>
> 
> Saeed, please pick this up.
> 
> Thank you.

Applied to net-next-mlx5.

Thanks !