netdev - Re: [PATCH v2 2/2] r8169: Avoid pointer aliasing

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Message-ID: <ec6f4c11-ca76-5cd8-8b79-b896f502ddb0@gmail.com>
Date:   Tue, 5 Feb 2019 21:23:27 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Joe Perches <joe@...ches.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>, thierry.reding@...il.com
Cc:     andrew@...n.ch, nic_swsd@...ltek.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] r8169: Avoid pointer aliasing

On 05.02.2019 21:18, Joe Perches wrote:
> On Tue, 2019-02-05 at 12:04 -0800, Eric Dumazet wrote:
>>
>> On 02/05/2019 10:42 AM, Joe Perches wrote:
>>> It's declared after a pointer so it is already is 2 byte aligned.
>>>
>>> A lot of drivers wouldn't work otherwise.
>>
>> Maybe these drivers are only used on arches where this does not matter.
> 
> Possible.
> 
> I had only grepped through the sources looking for
> declarations using:
> 
> $ git grep -B1 '\[ETH_ALEN\];' -- '*.c' | grep -A1 '\*'
> 
> It's quite a few files in net/ too btw.
> 
> I still think adding __align(<even#>) is unnecessary here unless
> it follows something like a bool or a u8.
> 
> 
I there's such a controversy, then it may be better to stay with
the current code, or?