On Thu, Apr 25, 2013 at 07:42:11PM +0200, Andi Kleen wrote: > There's the non cachable region tracking. But there's no guarantee a > MMIO has to be in there, driver may still rely just on MTRRs. Also > there may be MMIOs the kernel doesn't know about which just happen > to be somewhere in the direct mapping. > > I don't see any reliable way to detect all mmios. Hmm.. that's unfortunate. OK, so how about we use something like: is_kernel_text() || is_module_text_address() And bail if not; that should at least make it work for the simple case or normal text and not be worse than what you propose for JIT stuff. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html