dma-buf/fence: add fence_is_later()
Return true when fence 1 is later than fence 2 without checking if any of them are signaled. Useful for driver specific resource handling based on fences. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
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