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    SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v2

    * Yinghai Lu <yhlu.kernel.send@gmail.com> wrote:

    > some BIOS like to use continus MTRR layout, and X driver can not add
    > WB entries for graphical cards when 4g or more RAM installed.
    >
    > the patch will change MTRR to discrete.
    >
    > mtrr_chunk_size= could be used to have smaller continuous block to
    > hold holes. default is 256m, could be set according to size of
    > graphics card memory.

    hm.

    > +static int disable_mtrr_cleanup;

    i think this should be default-disabled. Touching MTRRs on a live system
    could interact with SMM and MCE handlers.

    how relevant is this feature with modern Xorg? I thought modern Xorg
    would get its mappings via /sys, hence it would not have to touch MTRRs
    at all.

    Ingo


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