linux-kernel - Re: [checkpatch.pl] two bugs

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Date:	Thu, 23 Oct 2008 12:54:21 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	rdunlap@...otime.net, jschopp@...tin.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [checkpatch.pl] two bugs

On Thu, Oct 23, 2008 at 08:27:34PM +0900, Tetsuo Handa wrote:
> Hello.
> 
> I think these are bugs.
> 
> Regards.
> -----
> 
> Bug 1:
>   assignment in 'if' is not warned if '\n' is inserted before the assignment.

Yep that looks wrong, too line oriented.

> # cat /tmp/test1.c
> void foo(void)
> {
> 	int i = 0;
> 	if (0 ||
> 	    (i = 0) != 0)
> 		return;
> }
> # /usr/src/vanilla/linux-2.6.27.3/scripts/checkpatch.pl --file /tmp/test1.c
> total: 0 errors, 0 warnings, 7 lines checked
> 
> /tmp/test1.c has no obvious style problems and is ready for submission.
> # ./scripts/checkpatch.pl-testing --strict --file /tmp/test1.c
> total: 0 errors, 0 warnings, 0 checks, 7 lines checked
> 
> /tmp/test1.c has no obvious style problems and is ready for submission.
> 
> 
> 
> Bug 2:
>   'while' placed after 'if { }' block is not handled properly.
> 
> # cat /tmp/test2.c
> int i;
> void foo(void)
> {
> 	if (!i) {
> 		i++;
> 		return;
> 	}
> 	while (i);
> }
> # /usr/src/vanilla/linux-2.6.27.3/scripts/checkpatch.pl --file /tmp/test2.c
> ERROR: trailing statements should be on next line
> #8: FILE: tmp/test2.c:8:
> +       while (i);
> 
> ERROR: while should follow close brace '}'
> #8: FILE: tmp/test2.c:8:
> +       }
> +       while (i);
> 
> total: 2 errors, 0 warnings, 9 lines checked
> 
> /tmp/test2.c has style problems, please review.  If any of these errors
> are false positives report them to the maintainer, see
> CHECKPATCH in MAINTAINERS.
> # ./scripts/checkpatch.pl-testing --strict --file /tmp/test2.c
> ERROR: trailing statements should be on next line
> #8: FILE: tmp/test2.c:8:
> +       while (i);
> +       while (i);

Hmmm, we have done a lot of work here to figure out this is a while
without a do and therefore the ; should be on the next line; yet we then
let the looser check below fire too.  A bug indeed.

> ERROR: while should follow close brace '}'
> #8: FILE: tmp/test2.c:8:
> +       }
> +       while (i);
> 
> total: 2 errors, 0 warnings, 0 checks, 9 lines checked

Thanks for your reports.  Will get them on the tofix list.

-apw
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