netdev - Re: [PATCH] net: nixge: Add __packed attribute to DMA descriptor struct

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Message-ID: <20180621183050.GA9986@archbook>
Date:   Thu, 21 Jun 2018 13:30:50 -0500
From:   Moritz Fischer <mdf@...nel.org>
To:     David Miller <davem@...emloft.net>
Cc:     f.fainelli@...il.com, mdf@...nel.org, keescook@...omium.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: nixge: Add __packed attribute to DMA descriptor
 struct

Hi David,

On Wed, Jun 20, 2018 at 07:37:50AM +0900, David Miller wrote:
> From: Florian Fainelli <f.fainelli@...il.com>
> Date: Tue, 19 Jun 2018 10:13:55 -0700
> 
> > How could padding be inserted given than all of the structure members
> > are naturally aligned (all u32 type). Compiler bug?
> 
> Agreed, this looks completely unnecessary.
> 
> __packed should only be used when absolutely necessary because using
> it generates less efficient code on some architectures.

Thanks for your input, will fix with the whole series when I submit it.

- Moritz