netdev - Re: [PATCH v2 02/16] thunderbolt: Add support for XDomain properties

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Date:   Tue, 26 Sep 2017 21:33:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mika.westerberg@...ux.intel.com
Cc:     gregkh@...uxfoundation.org, andreas.noever@...il.com,
        michael.jamet@...el.com, yehezkel.bernat@...el.com,
        amir.jer.levy@...el.com, Mario.Limonciello@...l.com,
        lukas@...ner.de, andriy.shevchenko@...ux.intel.com, andrew@...n.ch,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 02/16] thunderbolt: Add support for XDomain
 properties

From: Mika Westerberg <mika.westerberg@...ux.intel.com>
Date: Mon, 25 Sep 2017 14:07:24 +0300

> +struct tb_property_entry {
> +	u32 key_hi;
> +	u32 key_lo;
> +	u16 length;
> +	u8 reserved;
> +	u8 type;
> +	u32 value;
> +} __packed;
> +
> +struct tb_property_rootdir_entry {
> +	u32 magic;
> +	u32 length;
> +	struct tb_property_entry entries[];
> +} __packed;
> +
> +struct tb_property_dir_entry {
> +	u32 uuid[4];
> +	struct tb_property_entry entries[];
> +} __packed;

There is no apparent need for __packed here, and __packed should be
avoided unless absolutely necessary as it pessimizes the code
significantly on some architectures.

Please remove __packed from these datastructures unless you can
prove it is absolutely needed and, in such case, please document
in a comment why that requirement exists.  Because from the layout
of these types, everything will be packed in just fine without
__packed.

Thank you.