staging: erofs: atomic_cond_read_relaxed on ref-locked workgroup

	preempt_enable();

}

#if defined(CONFIG_SMP)

static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)

{

	return atomic_cond_read_relaxed(&grp->refcount,

					VAL != EROFS_LOCKED_MAGIC);

}

#else

static inline int erofs_wait_on_workgroup_freezed(struct erofs_workgroup *grp)

{

	int v = atomic_read(&grp->refcount);

	/* workgroup is never freezed on uniprocessor systems */

	DBG_BUGON(v == EROFS_LOCKED_MAGIC);

	return v;

}

#endif

static inline bool erofs_workgroup_get(struct erofs_workgroup *grp, int *ocnt)

{

	const int locked = (int)EROFS_LOCKED_MAGIC;

	int o;

repeat:

	o = atomic_read(&grp->refcount);

	/* spin if it is temporarily locked at the reclaim path */

	if (unlikely(o == locked)) {

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)

		do

			cpu_relax();

		while (atomic_read(&grp->refcount) == locked);

#endif

		goto repeat;

	}

	o = erofs_wait_on_workgroup_freezed(grp);

	if (unlikely(o <= 0))

		return -1;