parisc: Improve interrupt handling in arch_spin_lock_flags()

static inline int arch_spin_is_locked(arch_spinlock_t *x)

{

	volatile unsigned int *a = __ldcw_align(x);

	smp_mb();

	return *a == 0;

}

#define arch_spin_lock(lock) arch_spin_lock_flags(lock, 0)

static inline void arch_spin_lock(arch_spinlock_t *x)

{

	volatile unsigned int *a;

	a = __ldcw_align(x);

	while (__ldcw(a) == 0)

		while (*a == 0)

			cpu_relax();

}

static inline void arch_spin_lock_flags(arch_spinlock_t *x,

					 unsigned long flags)

{

	volatile unsigned int *a;

	unsigned long flags_dis;

	a = __ldcw_align(x);

	while (__ldcw(a) == 0)

	while (__ldcw(a) == 0) {

		local_save_flags(flags_dis);

		local_irq_restore(flags);

		while (*a == 0)

			if (flags & PSW_SM_I) {

				local_irq_enable();

				cpu_relax();

				local_irq_disable();

			} else

			cpu_relax();

		local_irq_restore(flags_dis);

	}

}

#define arch_spin_lock_flags arch_spin_lock_flags