On Fri, 2006-03-17 at 17:13 +0000, Hugh Dickins wrote: > You seem to be asking to "revoke" an mmap: Yes. We'd like this ability, too. > Though it looks like subsequent userspace accesses will then go to > do_anonymous_page, giving ZERO_PAGE to read faults or a fresh anon > page to write faults: I think I'd prefer it if pte_none accesses in > a VM_PFNMAP area gave SIGBUS, but unsure if we can change that now. It would be unfortunate if userspace were spinning on a chip register, waiting for the register to transition from zero to non-zero, and we replaced that mapping with an anonymous page. In that case, userspace could potentially spin forever, having no way to detect the demise of the device. <b - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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