linux-kernel - Re: [PATCH] 0/3 checkpatch updates, new checkfiles script

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Date:	Sun, 7 Oct 2007 15:05:47 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Ingo Molnar <mingo@...e.hu>, apw@...dowen.org
Cc:	Erez Zadok <ezk@...sunysb.edu>, rdunlap@...otime.net,
	jschopp@...tin.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 0/3 checkpatch updates, new checkfiles script 

In message <20071006111343.GA29484@...e.hu>, Ingo Molnar writes:
> 
> * Erez Zadok <ezk@...sunysb.edu> wrote:
> 
> > So, I ran the above script and it found nearly 1.5 million reported 
> > warnings/errors, with drivers being the largest abuser, not 
> > surprisingly. [...]
> 
> have you tried that with the latest version too:
> 
>   http://www.kernel.org/pub/linux/kernel/people/apw/checkpatch/checkpatch.pl-next
> 
> it outputs far fewer false positives.
> 
> 	Ingo

Andy, Ingo,

I tried the new checkpatch.pl on 2.6.23-rc9:

$ ./scripts/checkpatch.pl -q --file --emacs fs/namei.c

and got many perl warnings such as:

Use of uninitialized value in concatenation (.) or string at ./scripts/checkpatch.pl line 455.

followed by the usual verbose error message instead of one-per-line as I
assume the --emacs option is supposed to produce:

:2823: WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable
#2823: FILE: namei.c:2820:
+EXPORT_SYMBOL(vfs_mkdir);

BTW, calling the option --emacs is a bit too restrictive.  Emacs didn't
invent the format of "filename:linenumeber:message".  C compilers had it
before.  Even "grep -n *" had it before.  That's why I think calling it a
"terse output" option may be more accurate.

The following small patch to checkpath.pl-next seems to fix the perl
warnings, but it still outputs the long error messages along with the
shorter one-liners.

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index bdc493e..bbc4825 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -85,7 +85,7 @@ for my $filename (@ARGV) {
 		push(@rawlines, $_);
 	}
 	close(FILE);
-	if (!process($ARGV, @rawlines)) {
+	if (!process($filename, @rawlines)) {
 		$exit = 1;
 	}
 	@rawlines = ();
@@ -452,7 +452,7 @@ sub process {

 		my $rawline = $line;

-		$prefix = "$ARGV:$linenr: " if ($emacs);
+		$prefix = "$filename:$linenr: " if ($emacs);

 #extract the filename as it passes
 		if ($line=~/^\+\+\+\s+(\S+)/) {

Cheers,
Erez.
-
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