linux-kernel - Re: [PATCH] checkpatch: consolidate if (foo) bar(foo) checks and add debugfs

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Date:	Tue, 20 Nov 2012 16:39:56 +0000
From:	Andy Whitcroft <apw@...onical.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Constantine Shulyupin <const@...elinux.com>,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org
Subject: Re: [PATCH] checkpatch: consolidate if (foo) bar(foo) checks and add
 debugfs_remove

On Tue, Nov 20, 2012 at 07:51:17AM -0800, Joe Perches wrote:
> On Tue, 2012-11-20 at 15:37 +0000, Andy Whitcroft wrote:
> > Consolidate the if (foo) bar(foo) detectors into a single check.  Add
> > debugfs_remove and family.
> > 
> > Based on a patch by Constantine Shulyupin <const@...eLinux.com>.
> []
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
> >  
> > +# check for needless "if (<foo>) fn(<foo>)" uses
> > +		if ($prevline =~ /\bif\s*\(\s*($Lval)\s*\)/) {
> > +			my $expr = '\s*\(\s*' . quotemeta($1) . '\s*\)\s*;';
> > +
> []
> > +# check for needless debugfs_remove() and debugfs_remove_recursive*() checks
> 
> Hey Andy, that's an incomplete comment.
> Just remove it.

Oh it is meant to drop next to the other comments from the preceeding
hunks which are being removed, it should end up looking like this:

# check for needless kfree() checks
# check for needless usb_free_urb() checks
# check for needless debugfs_remove() and debugfs_remove_recursive*() checks

Admitedly the trailing checks on each are a little redundant, but it is
intended to retain the list of functions affected.

> 
> > +			if ($line =~ /\b(kfree|usb_free_urb|debugfs_remove(?:_recursive)?)$expr/) {
> > +				WARN('NEEDLESS_IF',
> > +				     "$1(NULL) is safe this check is probably not required\n" . $hereprev);
> >  			}
> >  		}
> >  

-apw
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