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From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <longman@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Davidlohr Bueso <dave@stgolabs.net>,
	"Theodore Y. Ts'o" <tytso@mit.edu>,
	Oleg Nesterov <oleg@redhat.com>,
	Amir Goldstein <amir73il@gmail.com>, Jan Kara <jack@suse.cz>,
	Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v3 1/2] locking/rwsem: Add a new RWSEM_ANONYMOUSLY_OWNED flag
Date: Tue, 15 May 2018 19:48:37 +0200	[thread overview]
Message-ID: <20180515174837.GL12217@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <1526405884-4860-2-git-send-email-longman@redhat.com>

On Tue, May 15, 2018 at 01:38:03PM -0400, Waiman Long wrote:
> diff --git a/kernel/locking/rwsem.c b/kernel/locking/rwsem.c
> index 30465a2..b7208e1 100644
> --- a/kernel/locking/rwsem.c
> +++ b/kernel/locking/rwsem.c
> @@ -130,7 +130,8 @@ void up_read(struct rw_semaphore *sem)
>  void up_write(struct rw_semaphore *sem)
>  {
>  	rwsem_release(&sem->dep_map, 1, _RET_IP_);
> -	DEBUG_RWSEMS_WARN_ON(sem->owner != current);
> +	DEBUG_RWSEMS_WARN_ON((sem->owner != current) &&
> +			     !rwsem_has_anonymous_owner(sem->owner));

Why? Don't we always do percpu_rwsem_acquire() before up?

>  
>  	rwsem_clear_owner(sem);
>  	__up_write(sem);

  parent reply	other threads:[~2018-05-15 17:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-15 17:38 [PATCH v3 0/2] locking/rwsem: Fix DEBUG_RWSEM warning from thaw_super() Waiman Long
2018-05-15 17:38 ` [PATCH v3 1/2] locking/rwsem: Add a new RWSEM_ANONYMOUSLY_OWNED flag Waiman Long
2018-05-15 17:46   ` Peter Zijlstra
2018-05-15 17:48     ` Waiman Long
2018-05-15 17:48   ` Peter Zijlstra [this message]
2018-05-15 17:52     ` Waiman Long
2018-05-15 17:55       ` Peter Zijlstra
2018-05-15 17:56         ` Waiman Long
2018-05-15 18:02   ` Peter Zijlstra
2018-05-15 17:38 ` [PATCH v3 2/2] locking/percpu-rwsem: Annotate rwsem ownership transfer by setting RWSEM_OWNER_UNKNOWN Waiman Long
2018-05-15 17:58   ` Peter Zijlstra
2018-05-15 18:02     ` Waiman Long
2018-05-15 18:05       ` Amir Goldstein
2018-05-15 18:45         ` Waiman Long
2018-05-15 18:05       ` Peter Zijlstra
2018-05-15 18:35         ` Waiman Long
2018-05-15 18:02     ` Matthew Wilcox
2018-05-15 18:07       ` Peter Zijlstra
2018-05-15 18:45       ` Waiman Long
2018-05-15 21:21         ` Matthew Wilcox
2018-05-15 21:30           ` Waiman Long

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