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Add a simple callback for retrieving the current expiry time for an HrTimer. In rvkms, we use the HrTimer expiry value in order to calculate the approximate vblank timestamp during each emulated vblank interrupt. Signed-off-by: Lyude Paul <[email protected]> Reviewed-by: Andreas Hindborg <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Andreas Hindborg <[email protected]>