linux-kernel - Re: False positive in checkpatch

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Message-ID: <20130924142453.GK13914@dm>
Date:	Tue, 24 Sep 2013 15:24:53 +0100
From:	Andy Whitcroft <apw@...onical.com>
To:	Joe Perches <joe@...ches.com>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: False positive in checkpatch

On Mon, Sep 23, 2013 at 09:21:07PM -0700, Joe Perches wrote:
> On Mon, 2013-09-23 at 15:59 -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > The checkpatch.pl script complains as follows:
> > 
> > ERROR: need consistent spacing around '*' (ctx:WxB)
> > #57: FILE: include/linux/rcupdate.h:564:
> > +		ACCESS_ONCE(p) = (typeof(*(v)) __force space *)(v); \
> > 
> > Of course, the two uses of '*' are doing different things, so it should
> > be OK for the spacing to be different.
> > 
> > Could you please fix this?
> > 
> > 							Thanx, Paul
> > 
> 
> Hi Paul.
> 
> Try this patch: https://lkml.org/lkml/2013/9/2/428
> 
> Andy?  Can you verify this suggested patch please?

Ok so fundamentally this goes wrong because we detect the typeof()
__force part as a type, but 'space' which is a type subsituted in is not
so identifiable.  This leads to us identifying the '*' as a binary one.

You patch prevents the error being emitted indeed, but as we have
missidentified it anything else which applies to the correct type would
be missed I think.

I will see if I can get this to identify this form better.

-apw
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