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    SubjectRe: [PATCH 4/5] x86, mm: Add set_memory_wt() for WT
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    On Sun, 2014-09-07 at 09:49 -0700, Andy Lutomirski wrote:
    > On Sun, Sep 7, 2014 at 1:49 AM, Yigal Korman <yigal@plexistor.com> wrote:
    > > I think that what confused Andy (or at least me) is the documentation in Documentation/x86/pat.txt
    > > If it's possible, can you please update pat.txt as part of the patch?
    >
    > Indeed. That file seems to indicate several times that the intended
    > use of set_memory_xyz is for RAM.


    Good point. pat.txt is correct that the "intended" use of
    set_memory_xyz() is for RAM since there is no other way to set non-WB
    attribute for RAM. For reserved memory, one should call ioremap_xyz()
    to map with the xyz attribute directly. From the functionality POV,
    set_memory_xyz() works for reserved memory, but such usage is not
    intended.

    Should I drop the patch 4/5 until we can track the use of WT for RAM?

    Thanks,
    -Toshi




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