linux-kernel - Re: [PATCH 12/14] get_unmapped_area handles MAP

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Date:	Thu, 05 Apr 2007 09:14:12 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org,
	Linux Memory Management <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/14] get_unmapped_area handles MAP_FIXED in /dev/mem
	(nommu)

On Wed, 2007-04-04 at 11:31 +0100, David Howells wrote:
> Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> 
> > +	if (flags & MAP_FIXED)
> > +		if ((addr >> PAGE_SHIFT) != pgoff)
> > +			return (unsigned long) -EINVAL;
> 
> Again... in NOMMU-mode there is no MAP_FIXED - it's rejected before we get
> this far.
> 
> > -	return pgoff;
> > +	return pgoff << PAGE_SHIFT;
> 
> That, however, does appear to be a genuine bugfix.

I'll separate it from the rest of the patches

Ben.


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