Re: Questions about fbdriver integration

[Ico Doornekamp <fbdev@zevv.nl>]

* On 2007-11-24 Jaya Kumar <jayakumar.lkml@gmail.com> wrote  :

> On Nov 24, 2007 5:14 PM, Ico Doornekamp <fbdev@zevv.nl> wrote:
> > Is the deferred IO code currently known to work properly ?
> >
> 
> The deferred IO code does not work properly at the moment. The symptom
> is that only the first write to the framebuffer is detected. I have a
> patch to fix this which I've tested to work on 2.6.22.10. You can
> cherrypick the fb_defio.c changes from the following post.
> 
> http://marc.info/?l=linux-fbdev-devel&m=119412505902140&w=2

This seems to fix my mmap problem, although the first mmap
access yields a kernel warning:

	WARNING: at fs/buffer.c:696 __set_page_dirty()
	[<c01622f8>] __set_page_dirty+0xb8/0xf0
	[<c0134169>] set_page_dirty+0x29/0x50
	[<c0134d5b>] set_page_dirty_balance+0xb/0x40
	[<c0139470>] __do_fault+0x160/0x340
	[<c013a9d3>] handle_mm_fault+0xd3/0x3d0

In spite of the warning, mmaping now works fine. Still no output from
the virtual console though.

Thank you,

Ico

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