On Thu, Mar 20, 2008 at 6:39 AM, Andrew Morton
[off-list ref] wrote:

 Well all we have in the changelog is

  Implement support for the E-Ink Metronome controller.  It provides an
  mmapable interface to the controller using defio support.  It was tested
  with a gumstix pxa255 with Vizplex media using Xfbdev and various X
  clients such as xeyes, xpdf, xloadimage.

 grump.  This say nothing at all about the change to drivers/video/fb_defio.c.

I apologize. I should have done better.

 a) the changelog _should_ document this change.  Please send a paragraph and
   I'll add it.

This patch fixes the following bug. Defio would cause a hang on write
access to the framebuffer as the page fault would be called
ad-infinitum. It fixes fb_defio by setting the mapping to be used by
page_mkclean.

 b) If this discussion hadn't happened, that bug (whatever it is) would
   have remained unfixed in 2.6.25.  As a direct consequence of poor
   changelogging.

Understood. The root cause of my flaw was my assumption that other
than me, there weren't any users of defio so I was in no hurry to get
it fixed.

 c) This bugfix (whatever it is) should have been in a separate patch.

Understood. It won't happen again.

Thanks,
jaya

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/