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    SubjectRe: [PATCH] [4/7] Don't use large pages to map the first 2/4MB of memory
    On Fri, 21 Mar 2008, Andi Kleen wrote:
    > > Also we split the first GB mapping anyway due to the various regions
    > > (NX, RO, UC) in there.
    > I didn't think so unless you have DEBUG_RODATA enabled?

    NX is independent of DEBUG_RODATA and the RODATA protection should be
    made unconditional on anyway.

    > Also there
    > should be no UC region there as known by the kernel. There might
    > be a WC region there from the frame buffer code, but that is an MTRR,
    > not a pageattr.

    The first ioremap of the PCI space splits the GB page as well.



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