linux-kernel - Re: checkpatch.pl false positive

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Date:   Mon, 22 May 2017 11:52:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Antonio Niño Díaz <antonio_nd@...look.com>,
        "apw@...onical.com" <apw@...onical.com>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: checkpatch.pl false positive

On Fri, 2017-05-19 at 09:57 +0000, Antonio Niño Díaz wrote:
> Hello,

Hi.

> I think I've hit a corner case in checkpatch.pl. It is easy to reproduce, just create a patch with a new line such as:
> 
> #define MY_HEADER <header.h>

[ checkpatch outputs ]

> config.h:9: ERROR: spaces required around that '<' (ctx:WxV)
> +#define MY_HEADER <header.h>                 ^
> config.h:9: ERROR: spaces required around that '>' (ctx:VxE)
> +#define MY_HEADER <header.h>

Yeah, checkpatch doesn't know about the #define before the other
things
it tests.

> Will you add this as an exception, or it is not an issue for
> you as the Linux kernel doesn't really use this weird system?

Probably not as it's not a kernel usage and
I can't think of a decent way to avoid it.

maybe some substitution like

$rawline =~ s/^(\s*#\s*define\s+\w+\s+)<([^>]+>)/\1"\2"/

could help, but it's pretty obscure and probably not
used in many other projects.

Maybe you could add and keep it local to your use.