DENTRY_WARN_ONCE
DENTRY_WARN_ONCE(((dentry)->d_flags & (DCACHE_LRU_LIST | DCACHE_SHRINK_LIST)) != (x), (dentry))
DENTRY_WARN_ONCE(d_really_is_positive(dentry), dentry);
DENTRY_WARN_ONCE(dentry->d_lockref.count >= 0, dentry);