On 04/11/2019 04:12 AM, Peter Zijlstra wrote: > On Wed, Apr 10, 2019 at 02:42:19PM -0400, Waiman Long wrote: >> The owner field in the rw_semaphore structure is used primarily for >> optimistic spinning. However, identifying the rwsem owner can also be >> helpful in debugging as well as tracing locking related issues when >> analyzing crash dump. The owner field may also store state information >> that can be important to the operation of the rwsem. >> >> So the owner field is now made a permanent member of the rw_semaphore >> structure irrespective of CONFIG_RWSEM_SPIN_ON_OWNER. > sem->owner is still initialized under CONFIG_RWSEM_SPIN_ON_OWNER.
Oh, you are right. I missed that part. I will fix it in the next version. Cheers, Longman
