x86/smp/boot: Add cmdline "cpu_init_udelay=N" to specify cpu_up() delay

	cpuidle.off=1	[CPU_IDLE]

			disable the cpuidle sub-system

	cpu_init_udelay=N

			[X86] Delay for N microsec between assert and de-assert

			of APIC INIT to start processors.  This delay occurs

			on every CPU online, such as boot, and resume from suspend.

			Default: 10000

	cpcihp_generic=	[HW,PCI] Generic port I/O CompactPCI driver

			Format:

			<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]

	}

}

/*

 * The Multiprocessor Specification 1.4 (1997) example code suggests

 * that there should be a 10ms delay between the BSP asserting INIT

 * and de-asserting INIT, when starting a remote processor.

 * But that slows boot and resume on modern processors, which include

 * many cores and don't require that delay.

 *

 * Cmdline "init_cpu_udelay=" is available to over-ride this delay.

 */

#define UDELAY_10MS_DEFAULT 10000

static unsigned int init_udelay = UDELAY_10MS_DEFAULT;

static int __init cpu_init_udelay(char *str)

{

	get_option(&str, &init_udelay);

	return 0;

}

early_param("cpu_init_udelay", cpu_init_udelay);

/*

 * Poke the other CPU in the eye via NMI to wake it up. Remember that the normal

 * INIT, INIT, STARTUP sequence will reset the chip hard for us, and this

		pr_debug("Waiting for send to finish...\n");

		send_status = safe_apic_wait_icr_idle();

		mdelay(10);

		mdelay(init_udelay);

		pr_debug("Deasserting INIT\n");