On 06/04/17 21:20, Radim Krčmář wrote:
> Some operations must ensure that the guest is not running with stale
> data, but if the guest is halted, then the update can wait until another
> event happens. kvm_make_all_requests() currently doesn't wake up, so we
> can mark all requests used with it.
>
> First 8 bits were arbitrarily reserved for request numbers.
>
> Most uses of requests have the request type as a constant, so a compiler
> will optimize the '&'.
>
> An alternative would be to have an inline function that would return
> whether the request needs a wake-up or not, but I like this one better
> even though it might produce worse assembly.
>
> Suggested-by: Christoffer Dall <cd...@linaro.org>
> Signed-off-by: Radim Krčmář <rkrc...@redhat.com>
> ---
> Btw. do you recall which macro allowed to define bitmasks? (It has
> two arguments, FROM and TO.)
GENMASK (and its _ULL variant), defined in include/linux/bitops.h.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
