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

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Message-ID: <4aea523a3bc5be0d944f7ed9fadac276b7115002.camel@perches.com>
Date:   Tue, 05 Feb 2019 12:18:09 -0800
From:   Joe Perches <joe@...ches.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>, thierry.reding@...il.com
Cc:     hkallweit1@...il.com, 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 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.