snd_use_lock_sync_helper 20 sound/core/seq/seq_lock.h void snd_use_lock_sync_helper(snd_use_lock_t *lock, const char *file, int line); snd_use_lock_sync_helper 21 sound/core/seq/seq_lock.h #define snd_use_lock_sync(lockp) snd_use_lock_sync_helper(lockp, __BASE_FILE__, __LINE__)