linux-kernel - Re: [PATCH] Clarify error on directive in macro arguments (Re: [PATCH] jffs2: fix sparse errors: directive in argument list)

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Date:	Wed, 20 Nov 2013 15:53:16 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Greg Price <price@....EDU>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Christopher Li <sparse@...isli.org>,
	Joe Perches <joe@...ches.com>,
	Erico Nunes <nunes.erico@...il.com>,
	linux-sparse@...r.kernel.org, dwmw2 <dwmw2@...radead.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Clarify error on directive in macro arguments (Re:
 [PATCH] jffs2: fix sparse errors: directive in argument list)

On Sun, Nov 17, 2013 at 09:07:46PM -0500, Greg Price wrote:
> From: Greg Price <price@....edu>
> Date: Sun, 17 Nov 2013 17:57:41 -0800
> Subject: [PATCH] Clarify error on directive in macro arguments
> 
> Preprocessor directives in the arguments of a real function
> are innocuous and in some contexts common.  If a developer
> doesn't realize that a "function" is implemented as a macro,
> they may mistake this error for a false alarm.
> 
> See http://www.spinics.net/lists/kernel/msg1636974.html
> and http://www.spinics.net/lists/kernel/msg1636976.html
> for an example.
> 
> Easy enough to clarify that this is a macro, so do it.
> 
> Signed-off-by: Greg Price <price@....edu>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

Good call.

>  pre-process.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/pre-process.c b/pre-process.c
> index d521318..db58a97 100644
> --- a/pre-process.c
> +++ b/pre-process.c
> @@ -204,7 +204,7 @@ static struct token *collect_arg(struct token *prev, int vararg, struct position
>  		if (next->pos.newline && match_op(next, '#')) {
>  			if (!next->pos.noexpand) {
>  				sparse_error(next->pos,
> -					     "directive in argument list");
> +					     "directive in macro argument list");
>  				preprocessor_line(stream, p);
>  				__free_token(next);	/* Free the '#' token */
>  				continue;
> -- 
> 1.8.3.2
> --
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