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    SubjectRe: [PATCH 2/2] x86: mtrr_cleanup try gran_size to less than 1M
    Ingo Molnar wrote:
    > * J.A. Magallón <jamagallon@ono.com> wrote:
    >
    >> Also, on a 64 bit box with 4Gb, it gives this:
    >>
    >> cicely:~# cat /proc/mtrr
    >> reg00: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
    >> reg01: base=0x100000000 (4096MB), size=1024MB: write-back, count=1
    >> reg02: base=0x140000000 (5120MB), size= 512MB: write-back, count=1
    >> reg03: base=0x160000000 (5632MB), size= 256MB: write-back, count=1
    >> reg04: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1
    >>
    >> Patch below cleans up formatting, with space for big bases and sizes (64 Gb).
    >
    > applied to tip/x86/mtrr, thanks!
    >
    >> +++ arch/x86/kernel/cpu/mtrr/if.c 2008-10-03 00:22:34.000000000 +0200
    >> @@ -16,7 +16,7 @@
    >> static const char *const mtrr_strings[MTRR_NUM_TYPES] =
    >> {
    >> "uncachable", /* 0 */
    >> - "write-combining", /* 1 */
    >> + "write-combine", /* 1 */
    >
    > hm, maybe this bit could confuse versions of Xorg that modifies
    > /proc/mtrr - i.e. this could be part of the ABI towards user-space.
    > We'll see.
    >

    This *IS* part of the ABI toward userspace, although I think Xorg uses
    the ioctl() interface.

    -hpa
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