Re: [patch] SMP alternatives

[Alan Cox]

On Mer, 2005-11-23 at 10:42 -0800, 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.

There is a much much better way to do it than just user space and
without hitting cr3/cr4 - put "lock works" in the PAT and while we'll
have to add PAT support which we need to do anyway we would get a world
where on uniprocessor lock prefix only works on addresse targets we want
it to - ie pci_alloc_consistent() pages.

Alan

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/