linux-kernel - Re: [RFC v2][PATCH 00/35] consolidate pte mapping functions across all architectures

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Message-Id: <1242859102.11900.2.camel@nimitz>
Date:	Wed, 20 May 2009 15:38:22 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v2][PATCH 00/35] consolidate pte mapping functions across
 all architectures

On Wed, 2009-05-20 at 15:06 -0700, Jeremy Fitzhardinge wrote: 
> Dave Hansen wrote:
> > The steps are as follows, and should be bisectable:
> > 1. Break out all the functions into a new asm/ptemap.h and
> >    include it in place of the original functions.
> > 2. Move linux/mm.h arch-independent pte mapping code to
> >    linux/ptemap.h, include asm/ptemap.h there
> > 3. Include linux/ptemap.h directly at all use sites
> >    (only 39 of these kernel-wide)
> > 4. Standardize all the implementations to use
> >    pte_offset_kernel() as the basis for pte_offset_map()
> >    whenever possible.
> > 5. Create asm-generic/ptemap.h and consolidate all the
> >    architectures that share the pte_offset_kernel()
> >    implementations.
> > 6. Consolidate the three HIGHPTE implementations (x86,
> >    frv, ppc64) in asm-generic/ptemap.h.  
> > 7. Remove the direct asm/ptemap.h includes.   
> 
> This is a nice cleanup.  Did you consider going an extra step and 
> converting all the macros into #defines?

Yup.  I actually have a patch doing this sitting around that just needs
a bit of cleanup.  I'll certainly submit it if these get in.

-- Dave

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