linux-kernel - Re: [PATCH 1/2] Export get_user_pages

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Date:	Wed, 30 Jul 2008 10:28:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, lguest <lguest@...abs.org>,
	linux-kernel@...r.kernel.org, Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH 1/2] Export get_user_pages_fast

On Wed, 30 Jul 2008 20:18:45 +0300 Adrian Bunk <bunk@...nel.org> wrote:

> > > The export would still only be available on x86 since no other arch 
> > > would define CONFIG_HAVE_GET_USER_PAGES_FAST.
> > > 
> > 
> > That's presently true in Linus mainline.  The powerpc implementation is
> > in -mm, but apprarently needs a bit more work.
> 
> I still don't get the advantage of your suggestion.
> 
> With the powerpc implementation included your suggestion doesn't change 
> the fact that the export is available only on x86 and powerpc, and if a 
> driver author mistakenly uses it and only tests it's driver on x86 it 
> will still break on architectures other than x86 or powerpc.

On non-CONFIG_HAVE_GET_USER_PAGES_FAST architectures a
get_user_pages_fast() call will in fact call get_user_pages().

On CONFIG_HAVE_GET_USER_PAGES_FAST architectures, get_user_pages_fast()
is a real function.  All architectures which implement that function
should export it to modules.  Hence it should be exported from within
generic code.
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