linux-kernel - Re: agp/intel: Fix the pre-9xx chipset flush

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Date:	Mon, 20 Sep 2010 16:57:45 -0700
From:	Eric Anholt <eric@...olt.net>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	Brice.Goglin@...-lyon.org, airlied@...ux.ie,
	linux-kernel@...r.kernel.org
Subject: Re: agp/intel: Fix the pre-9xx chipset flush

On Thu, 16 Sep 2010 13:40:48 +0100, "Jan Beulich" <JBeulich@...ell.com> wrote:
> Eric,
> 
> in this patch you removed from intel_i830_setup_flush() a call to
> map_page_into_agp(), but you left in place the counterpart call from
> intel_i830_fini_flush() to unmap_page_from_agp()? Isn't it mere luck
> that on x86 this is only a call to set_pages_wb()?

Sounds like just an oversight.

> Further, is there really a point in doing the respective allocation
> with GFP_DMA32? Nor does __GFP_ZERO seem really necessary...

The hardware in question doesn't have memory above 32 bits, so either
way doesn't matter much.  Yeah, GFP_ZERO doesn't seem needed.

If you've got patches for agp, Chris Wilson's the kernel module
maintainer now, and Daniel Vetter's got a huge changeset queued to -next
to clean up the disaster that is the "agp" code for integrated graphics.

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