On Wed, Apr 30, 2014 at 09:33:34AM -0700, Jason Low wrote:
> > static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
> > {
> > struct task_struct *owner;
> > bool on_cpu = false;
>
> Wouldn't we want to initialize on_cpu = true. For the !owner case, I
> would expect that we want to spin for the lock.
>
> > rcu_read_lock();
> > owner = ACCESS_ONCE(sem->owner);
> > if (owner)
> > on_cpu = owner->on_cpu;
> > rcu_read_unlock();
> >
> > return on_cpu;
> > }
That would indeed be in line with that the mutex code does. Indeed!
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