On 03/05, Lai Jiangshan wrote: > > On 03/03/13 01:20, Oleg Nesterov wrote: > > On 03/02, Lai Jiangshan wrote: > >> > >> +void lg_rwlock_local_read_unlock(struct lgrwlock *lgrw) > >> +{ > >> + switch (__this_cpu_read(*lgrw->reader_refcnt)) { > >> + case 1: > >> + __this_cpu_write(*lgrw->reader_refcnt, 0); > >> + lg_local_unlock(&lgrw->lglock); > >> + return; > >> + case FALLBACK_BASE: > >> + __this_cpu_write(*lgrw->reader_refcnt, 0); > >> + read_unlock(&lgrw->fallback_rwlock); > >> + rwlock_release(&lg->lock_dep_map, 1, _RET_IP_); > > > > I guess "case 1:" should do rwlock_release() too. > > Already do it in "lg_local_unlock(&lgrw->lglock);" before it returns. > (I like reuse old code) Yes, I was wrong thanks. Another case when I didn't notice that you re-use the regular lg_ code... > > We need rwlock_acquire_read() even in the fast-path, and this acquire_read > > should be paired with rwlock_acquire() in _write_lock(), but it does > > spin_acquire(lg->lock_dep_map). Yes, currently this is the same (afaics) > > but perhaps fallback_rwlock->dep_map would be more clean. > > I can't tell which one is better. I try to use fallback_rwlock->dep_map later. I am not sure which one should be better too, please check. Again, I forgot that _write_lock/unlock use lg_global_*() code. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html