Re: [PATCH v2 2/2] x86/mm/pat, drivers/media/ivtv: move pat warn and replace WARN() with pr_warn()

Luis R. Rodriguez
2015-07-07T06:53:20Z

On Mon, Jul 6, 2015 at 5:44 PM, Luis R. Rodriguez <mcgrof@suse.com> wrote:
> If we really wanted to we could consider arch_phys_wc_add()

I mean adding a __arch_phys_wc_add() which does not check for pat_enabled().

> and
> deal with that this will not check for pat_enabled() and forces MTRR...
> I think Andy Luto won't like that very much though ? I at least don't
> like it since we did all this work to finally leave only 1 piece of
> code with direct MTRR access... Seems a bit sad. Since ipath will
> be removed we'd have only ivtv driver using this API, I am not sure if
> its worth it.

Since ipath is going away soon we'd just have one driver with the icky
#ifdef code. I'd rather see that and then require semantics / grammer
rules to require ioremap_wc() when used with arch_phys_wc_add(). I
don't think ivtv is worth to consider breaking the semantics and
requirements.

> Thoughts?

Luis