37 static void (*delay_halt_fn)(u64 start, u64 cycles) __ro_after_init;
63 static void delay_tsc(u64 cycles)  in delay_tsc()  argument
73 		if ((now - bclock) >= cycles)  in delay_tsc()
91 			cycles -= (now - bclock);  in delay_tsc()
105 static void delay_halt_tpause(u64 start, u64 cycles)  in delay_halt_tpause()  argument
107 	u64 until = start + cycles;  in delay_halt_tpause()
125 static void delay_halt_mwaitx(u64 unused, u64 cycles)  in delay_halt_mwaitx()  argument
129 	delay = min_t(u64, MWAITX_MAX_WAIT_CYCLES, cycles);  in delay_halt_mwaitx()
151 	u64 start, end, cycles = __cycles;  in delay_halt()  local
157 	if (!cycles)  in delay_halt()
163 		delay_halt_fn(start, cycles);  in delay_halt()
166 		if (cycles <= end - start)  in delay_halt()
169 		cycles -= end - start;  in delay_halt()