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Date: Mon, 29 Oct 2007 01:17:37 -0700
From: "Jaya Kumar" <jayakumar.lkml@gmail.com>
To: "Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: vm_ops.page_mkwrite() fails with vmalloc on 2.6.23
Cc: stefani@seibold.net, linux-kernel@vger.kernel.org,
       "David Howells" <dhowells@redhat.com>, linux-mm@kvack.org
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On 10/29/07, Andrew Morton <akpm@linux-foundation.org> wrote:
> On Mon, 22 Oct 2007 16:40:57 +0200 Stefani Seibold <stefani@seibold.net> wrote:
> >
> > The problem original occurs with the fb_defio driver (driver/video/fb_defio.c).
> > This driver use the vm_ops.page_mkwrite() handler for tracking the modified pages,
> > which will be in an extra thread handled, to perform the IO and clean and
> > write protect all pages with page_clean().
> >

Hi,

An aside, I just tested that deferred IO works fine on 2.6.22.10/pxa255.

I understood from the thread that PeterZ is looking into page_mkclean
changes which I guess went into 2.6.23. I'm also happy to help in any
way if the way we're doing fb_defio needs to change.

Thanks,
jaya