linux-kernel - Re: [PATCH] fix sparse happy borkage when including gfp.h

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Date:	Fri, 15 Apr 2011 07:27:54 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-sparse@...r.kernel.org
Subject: Re: [PATCH] fix sparse happy borkage when including gfp.h

On Fri, 2011-04-15 at 14:33 +0900, KOSAKI Motohiro wrote:
> Hello,
> > On Fri, 2011-04-15 at 12:14 +0900, KOSAKI Motohiro wrote:
> > > >  #ifdef CONFIG_DEBUG_VM
> > > > -             BUG_ON((GFP_ZONE_BAD >> bit) & 1);
> > > > +     BUG_ON((GFP_ZONE_BAD >> bit) & 1);
> > > >  #endif
> > > > -     }
> > > >       return z;
> > > 
> > > Why don't you use VM_BUG_ON?
> > 
> > I was just trying to make a minimal patch that did a single thing.
> > 
> > Feel free to submit another one that does that.  I'm sure there are a
> > couple more places that could use similar love.
> 
> I posted another approach patches a second ago. Could you please see it?

Those both look sane to me.  Those weren't biting me in particular, and
they don't fix the issue I was seeing.  But, they do seem necessary to
reduce some of the noise.

CC'ing the sparse mailing list.  We're seeing a couple of cases where
some gcc-isms are either stopping sparse from finding real bugs:

	http://marc.info/?l=linux-mm&m=130282454732689&w=2

or creating a lot of noise on some builds:

	http://marc.info/?l=linux-mm&m=130284428614058&w=2
	http://marc.info/?l=linux-mm&m=130284431014077&w=2

-- Dave

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