Re: [RFC Patch] use MTRR for write combining if PAT is not available

[Thomas Schlichter]

Suresh Siddha wrote:
> On Thu, 2009-10-22 at 21:31 -0700, Jesse Barnes wrote:
> > Here's a quick & dirty version, totally untested.  A cleaner approach
> > would be to separate the WC mapping routines and hide the return
> > -EINVAL in arch specific code...
> 
> Jesse How about this patch? Doing this in x86 is cleaner.
> 
> I would like Acks/sign-offs-by Thomas, Eric and Jesse, if it is ok with
> this patch and works.

Hmm, at this point I already was more than a week ago:
  http://marc.info/?l=linux-kernel&m=125537770514713&w=2

OK, I also modified ioremap() and set_memory_wc() but your patch is just part 
of what I did there...

And Eric Anholt answered:
> Seems like we should install an MTRR instead.  Requiring userland to set
> up the MTRR on the kernel's behalf is backwards.

Where I totally agree with him.

Regards,
  Thomas
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