Re: [tip:x86/mm] x86/mm/mtrr: Clean up mtrr_type_lookup()

Borislav Petkov
2015-07-31T15:27:18Z

On Fri, Jul 31, 2015 at 05:08:06PM +0200, Peter Zijlstra wrote:
> But its things like set_memory_XX(), and afaict that's all buggy against
> MTRR modifications.

I think the idea is to not do any MTRR modifications at some point:

>From Documentation/x86/pat.txt:

"... Ideally mtrr_add() usage will be phased out in favor of
arch_phys_wc_add() which will be a no-op on PAT enabled systems. The
region over which a arch_phys_wc_add() is made, should already have been
ioremapped with WC attributes or PAT entries, this can be done by using
ioremap_wc() / set_memory_wc()."

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
--