linux-kernel - Re: [PATCH RT] rt: add rwsem_is_contended() definition to rwsem

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Date:	Tue, 17 Feb 2015 11:09:11 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Clark Williams <williams@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH RT]  rt: add rwsem_is_contended() definition to rwsem_rt.h

* 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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