linux-kernel - Re: [PATCH] vm/agp: remove private page protection map

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Message-ID: <Pine.LNX.4.64.0607270059220.17518@blonde.wat.veritas.com>
Date:	Thu, 27 Jul 2006 00:59:44 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Dave Airlie <airlied@...ux.ie>
cc:	Andrew Morton <akpm@...l.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] vm/agp: remove private page protection map

On Thu, 27 Jul 2006, Dave Airlie wrote:
> > agp_convert_mmap_flags still using its own conversion from PROT_ to VM_
> > while there's an inline in mm.h (though why someone thought to optimize

My mistake: calc_vm_prot_bits() is actually in include/linux/mman.h
(which you are already #including, so no problem).

> > AGP keeps its own copy of the protection_map, upcoming DRM changes will
> > also require access to this map from modules.
> >
> > Signed-off-by: Hugh Dickins <hugh@...itas.com>
> 
> Signed-of-by: Dave Airlie <airlied@...ux.ie>

Thanks.  By the way, I hope you noticed that some architectures
(arm, m68k, sparc, sparc64) may adjust protection_map[] at startup:
so the old agp_convert_mmap_flags would supply the compiled in prot,
whereas the new agp_convert_mmap_flags supplies the adjusted prot.

I assume this is either irrelevant to you (no AGP on some arches?)
or an improvement (the adjusted prot more appropriate); but if you
weren't aware of it, please do check that those do what you want.

Hugh
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