linux-kernel - Re: [PATCH v2] net: dsa: Remove VLA usage

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Message-Id: <20180719.070858.620001411860238690.davem@davemloft.net>
Date:   Thu, 19 Jul 2018 07:08:58 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     andrew@...n.ch
Cc:     keescook@...omium.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, s.mesoraca16@...il.com,
        f.fainelli@...il.com, David.Laight@...lab.com
Subject: Re: [PATCH v2] net: dsa: Remove VLA usage

From: Andrew Lunn <andrew@...n.ch>
Date: Wed, 18 Jul 2018 22:37:25 +0200

> On Thu, Jul 19, 2018 at 05:33:33AM +0900, David Miller wrote:
>> From: Kees Cook <keescook@...omium.org>
>> Date: Mon, 16 Jul 2018 21:10:34 -0700
>> 
>> > From: Salvatore Mesoraca <s.mesoraca16@...il.com>
>> > 
>> > We avoid 2 VLAs by using a pre-allocated field in dsa_switch. We also
>> > try to avoid dynamic allocation whenever possible (when using fewer than
>> > bits-per-long ports, which is the common case).
>> > 
>> > Link: http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
>> > Link: http://lkml.kernel.org/r/20180505185145.GB32630@lunn.ch
>> > Signed-off-by: Salvatore Mesoraca <s.mesoraca16@...il.com>
>> > [kees: tweak commit subject and message slightly]
>> > Signed-off-by: Kees Cook <keescook@...omium.org>
>> 
>> Florian and Andrew, please review.
> 
> Last time there was some discussion of just always allocating it to
> make the code simpler. But the extra complexity is O.K.
> 
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

Great, applied, thanks!