Re: [RFC PATCH 3/11] x86, mm, pat: Change reserve_memtype() to handle WT type

[Andy Lutomirski]

On Tue, Jul 15, 2014 at 12:34 PM, Toshi Kani <toshi.kani@xxxxxx> wrote:
> This patch changes reserve_memtype() to handle the new WT type.
> When (!pat_enabled && new_type), it continues to set either WB
> or UC- to *new_type.  When pat_enabled, it can reserve a given
> non-RAM range for WT.  At this point, it may not reserve a RAM
> range for WT since reserve_ram_pages_type() uses the page flags
> limited to three memory types, WB, WC and UC.

FWIW, last time I looked at this, it seemed like all the fancy
reserve_ram_pages stuff was unnecessary: shouldn't the RAM type be
easy to track in the direct map page tables?

--Andy
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