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Certain use cases want to use CLOCK_BOOTTIME or CLOCK_REALTIME rather than CLOCK_MONOTONIC, instead of the default CLOCK_MONOTONIC. Add an IORING_TIMEOUT_BOOTTIME and IORING_TIMEOUT_REALTIME flag that allows timeouts and linked timeouts to use the selected clock source. Only one clock source may be selected, and we -EINVAL the request if more than one is given. If neither BOOTIME nor REALTIME are selected, the previous default of MONOTONIC is used. Link: https://github.com/axboe/liburing/issues/369 Signed-off-by: Jens Axboe <axboe@kernel.dk>