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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.

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