Messages in this thread |  | | Date | Tue, 17 Feb 2015 13:08:57 -0600 | From | Clark Williams <> | Subject | Re: [PATCH RT] rt: add rwsem_is_contended() definition to rwsem_rt.h |
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On Tue, 17 Feb 2015 11:09:11 +0100 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> * Clark Williams | 2014-08-27 16:09:28 [-0500]: > > >Thomas, > > > >The latest btrfs code uses rwsem_is_contended() in the function > >caching_thread(). On RT systems, include/linux/rwsem.h is replaced with > >include/linux/rwsem_rt.h which does not provide a definition for > >rwsem_is_contended(). This commit provides a definition that should > >work on RT (where the lock is actually an rt_mutex). > > I see that I added rwsem_is_contended() in v3.14-rt1 which does: > |static inline int rwsem_is_contended(struct rw_semaphore *sem) > |{ > | /* rt_mutex_has_waiters() */ > | return !RB_EMPTY_ROOT(&sem->lock.waiters); > |} > > Do you lack this in kernel prior to v3.14? > > Sebastian
Yes, that was the problem. I was back-porting to a 3.10 and was missing the definition. Sorry for the noise.
Clark [unhandled content-type:application/pgp-signature] |  |