Messages in this thread |  | | Date | Tue, 17 Feb 2015 11:09:11 +0100 | From | Sebastian Andrzej Siewior <> | Subject | Re: [PATCH RT] rt: add rwsem_is_contended() definition to rwsem_rt.h |
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* 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
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