netdev - Re: [EXT] Re: [PATCH net-next 08/17] net: atlantic: A2 driver-firmware interface

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Date:   Sun, 26 Apr 2020 18:05:05 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     irusskikh@...vell.com
Cc:     kuba@...nel.org, netdev@...r.kernel.org, mstarovoitov@...vell.com,
        dbogdanov@...vell.com
Subject: Re: [EXT] Re: [PATCH net-next 08/17] net: atlantic: A2
 driver-firmware interface

From: Igor Russkikh <irusskikh@...vell.com>
Date: Sun, 26 Apr 2020 11:50:19 +0300

> 
>> From: Jakub Kicinski <kuba@...nel.org>
>> Date: Fri, 24 Apr 2020 17:44:47 -0700
>> 
>>> On Fri, 24 Apr 2020 10:27:20 +0300 Igor Russkikh wrote:
>>>> +/* Start of HW byte packed interface declaration */
>>>> +#pragma pack(push, 1)
>>>
>>> Does any structure here actually require packing?
>> 
>> Yes, please use the packed attribute as an absolute _last_ resort.
> 
> These are HW bit-mapped layout API, without packing compiler may screw up
> alignments in some of these structures.

The compiler will not do that if you used fixed sized types properly.

Please remove __packed unless you can prove it matters.