linux-kernel - Re: [PATCH] cifs: Convert to use the fallthrough macro

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Date:   Sun, 09 Aug 2020 10:07:07 -0700
From:   Joe Perches <joe@...ches.com>
To:     Steve French <smfrench@...il.com>, linmiaohe <linmiaohe@...wei.com>
Cc:     Steve French <sfrench@...ba.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        samba-technical <samba-technical@...ts.samba.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cifs: Convert to use the fallthrough macro

On Sun, 2020-08-09 at 11:46 -0500, Steve French wrote:
> Is this conversion from "/* Fallthrough */"   to the preferred (?)
> "fallthrough;" documented anywhere?

Documentation/process/deprecated.rst

As there have been a long list of flaws `due to missing "break" statements
<https://cwe.mitre.org/data/definitions/484.html>`_, we no longer allow
implicit fall-through. In order to identify intentional fall-through
cases, we have adopted a pseudo-keyword macro "fallthrough" which
expands to gcc's extension `__attribute__((__fallthrough__))
<https://gcc.gnu.org/onlinedocs/gcc/Statement-Attributes.html>`_.