From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: [RFC PATCH - diffstat only] include/net: Remove extern from
 function prototypes
Date: Thu, 25 Jul 2013 01:27:49 +0000 (UTC)
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On Tue, 23 Jul 2013 at 17:58 GMT, Joe Perches <joe@perches.com> wrote:
> Function prototypes don't need to be declared
> extern in .h files.  It's assumed by the compiler
> and is as unnecessary as using auto is when
> declaring automatic/local variables in a block.
>

Since we all know this, why bother it? Having "extern" doesn't harm
readability, instead it probably helps.

...
>
> I believe it makes grepping for extern useful as
> all the matches are actual variables and structs.
>

You need a semantic tool.