linux-kernel - Re: [RFC][PATCH 32/35] Move users to asm-generic/ptemap.h

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Date:	Fri, 01 May 2009 11:08:58 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 32/35] Move users to asm-generic/ptemap.h

On Fri, 2009-05-01 at 13:43 -0400, Christoph Hellwig wrote:
> On Fri, May 01, 2009 at 07:42:51AM -0700, Dave Hansen wrote:
> > Now that we have everyone using pte_offset_kernel(),
> > we can plainy see that almost all the users are
> > exactly the same.
> > 
> > This takes all of those users and moves them over to
> > using asm-generic/ptemap.h instead.
> 
> s/users/implementations/g ?

Yeah, that's clearer.

> Also asm-generic/ptemap.h really wants a comment when architectures
> can use this generic version.

/*
 * If your architecture has direct-mapped PTE pages (no HIGHPTE)
 * then you just need to implement pte_offset_kernel() and include
 * this in your asm/ptemap.h.
 *
 * To support HIGHPTE, you need to have implementations of
 * kmap_atomic_pte() (which usually just calls kmap_atomic()),
 * pmd_page() and pmd_index().
 */


-- Dave

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