Merge "mutex: Add a delay into the SPIN_ON_OWNER wait loop."

#include <linux/interrupt.h>

#include <linux/debug_locks.h>

#include <linux/osq_lock.h>

#include <linux/delay.h>

#ifdef CONFIG_DEBUG_MUTEXES

# include "mutex-debug.h"

		 * values at the cost of a few extra spins.

		 */

		cpu_relax();

		/*

		 * On arm systems, we must slow down the waiter's repeated

		 * aquisition of spin_mlock and atomics on the lock count, or

		 * we risk starving out a thread attempting to release the

		 * mutex. The mutex slowpath release must take spin lock

		 * wait_lock. This spin lock can share a monitor with the

		 * other waiter atomics in the mutex data structure, so must

		 * take care to rate limit the waiters.

		 */

		udelay(1);

	}

	if (!waiter)