futex: Split out the first waiter attachment from lookup_pi_state()

	return 0;

}

static int

lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,

		union futex_key *key, struct futex_pi_state **ps)

{

	struct futex_q *match = futex_top_waiter(hb, key);

	struct futex_pi_state *pi_state = NULL;

	struct task_struct *p;

	pid_t pid = uval & FUTEX_TID_MASK;

/*

	 * If there is a waiter on that futex, validate it and

	 * attach to the pi_state when the validation succeeds.

 * Lookup the task for the TID provided from user space and attach to

 * it after doing proper sanity checks.

 */

	if (match)

		return attach_to_pi_state(uval, match->pi_state, ps);

static int attach_to_pi_owner(u32 uval, union futex_key *key,

			      struct futex_pi_state **ps)

{

	pid_t pid = uval & FUTEX_TID_MASK;

	struct futex_pi_state *pi_state;

	struct task_struct *p;

	/*

	 * We are the first waiter - try to look up the real owner and attach

	pi_state = alloc_pi_state();

	/*

	 * Initialize the pi_mutex in locked state and make 'p'

	 * Initialize the pi_mutex in locked state and make @p

	 * the owner of it:

	 */

	rt_mutex_init_proxy_locked(&pi_state->pi_mutex, p);

	return 0;

}

static int lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,

			   union futex_key *key, struct futex_pi_state **ps)

{

	struct futex_q *match = futex_top_waiter(hb, key);

	/*

	 * If there is a waiter on that futex, validate it and

	 * attach to the pi_state when the validation succeeds.

	 */

	if (match)

		return attach_to_pi_state(uval, match->pi_state, ps);

	/*

	 * We are the first waiter - try to look up the owner based on

	 * @uval and attach to it.

	 */

	return attach_to_pi_owner(uval, key, ps);

}

/**

 * futex_lock_pi_atomic() - Atomic work required to acquire a pi aware futex

 * @uaddr:		the pi futex user address