On Tue, Apr 26, 2022 at 06:01:51AM +0800, Yanjun Zhu wrote: > > 在 2022/4/26 3:02, Jason Gunthorpe 写道: > > On Mon, Apr 25, 2022 at 07:47:23AM +0800, Yanjun Zhu wrote: > > > 在 2022/4/22 23:57, Pearson, Robert B 写道: > > > > Use of rcu_read_lock solves this problem. Rcu_read_lock and spinlock on same data can > > > > Co-exist at the same time. That is the whole point. All this is going away soon. > > > This is based on your unproved assumption. > > No, Bob is right, RCU avoids the need for a BH lock on this XA, the > > only remaining issue is the AH creation atomic call path. > > If RCU is used, the similar issues like AH creation atomic call path will > become more. AH creation is unique, there will not be more cases like it. Jason
