linux-kernel - where to set framebuffer page read-only,when using differred IO?

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Date:	Thu, 28 Apr 2011 11:41:07 +0800
From:	april <aapril03@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: where to set framebuffer page read-only,when using differred IO?

Hi all:
I'm writing a driver, and want to catch the cpu write and just flush
page that cpu write before device engine access.
may be some thing like differred IO.
I read the differred IO and fb 's code, I can't found where it set the
page table entries for framebuffer pages to read-only.

Could anyone help to show where the frame buffer page set to read-only?

Thanks in advance
Aapril
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