netdev - Re: [PATCH v6] net: ip, diag -- Add diag interface for raw sockets

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Date:   Wed, 12 Oct 2016 01:50:22 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     gorcunov@...il.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, jhs@...atatu.com,
        dsa@...ulusnetworks.com, linux-kernel@...r.kernel.org,
        kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
        kaber@...sh.net, avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH v6] net: ip, diag -- Add diag interface for raw sockets

From: Cyrill Gorcunov <gorcunov@...il.com>
Date: Thu, 6 Oct 2016 13:00:55 +0300

> v6:
>  - use sdiag_raw_protocol() helper which will access @pad
>    structure used for raw sockets protocol specification:
>    we can't simply rename this member without breaking uapi.

Macros that look like function calls and are also lvalues tend to be
troublesome.

I know what you're trying to achieve, you want a named way to access
this so that the intent and semantics are clear.

But I'd rather you do something that provides a way by which normal
struct member accesses do the job, and your earlier patches achieved
this.