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

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Message-Id: <20180620.073750.642289685695664600.davem@davemloft.net>
Date:   Wed, 20 Jun 2018 07:37:50 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     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

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.