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    SubjectRe: [patch] SMP alternatives
    Linus Torvalds wrote:
    >
    > Of course, if it's in one of the low 12 bits of %cr3, there would have to
    > be a "enable this bit" in %cr4 or something. Historically, you could write
    > any crap in the low bits, I think.
    >

    No, most of them are RAZ, but there are at least a couple of bits which
    have effect (e.g. caching of the page tables.)

    However, with PAE there aren't really a whole lot of unused bits in CR3.

    -hpa
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