posix-cpu-timers: Use common permission check in posix_cpu_clock_get()

	return 0;

}

static int posix_cpu_clock_get_task(struct task_struct *tsk,

				    const clockid_t which_clock,

				    struct timespec64 *tp)

static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp)

{

	int err = -EINVAL;

	u64 rtn;

	if (CPUCLOCK_PERTHREAD(which_clock)) {

		if (same_thread_group(tsk, current))

			err = cpu_clock_sample(which_clock, tsk, &rtn);

	} else {

		if (tsk == current || thread_group_leader(tsk))

			err = cpu_clock_sample_group(which_clock, tsk, &rtn);

	}

	if (!err)

		*tp = ns_to_timespec64(rtn);

	return err;

}

	const clockid_t clkid = CPUCLOCK_WHICH(clock);

	struct task_struct *tsk;

	u64 t;

static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec64 *tp)

{

	const pid_t pid = CPUCLOCK_PID(which_clock);

	int err = -EINVAL;

	tsk = get_task_for_clock(clock);

	if (!tsk)

		return -EINVAL;

	if (pid == 0) {

		/*

		 * Special case constant value for our own clocks.

		 * We don't have to do any lookup to find ourselves.

		 */

		err = posix_cpu_clock_get_task(current, which_clock, tp);

	} else {

		/*

		 * Find the given PID, and validate that the caller

		 * should be able to see it.

		 */

		struct task_struct *p;

		rcu_read_lock();

		p = find_task_by_vpid(pid);

		if (p)

			err = posix_cpu_clock_get_task(p, which_clock, tp);

		rcu_read_unlock();

	}

	if (CPUCLOCK_PERTHREAD(clock))

		cpu_clock_sample(clkid, tsk, &t);

	else

		cpu_clock_sample_group(clkid, tsk, &t);

	put_task_struct(tsk);

	return err;

	*tp = ns_to_timespec64(t);

	return 0;

}

/*