linux-kernel - Re: [PATCH -mm 2/3] lockdep: mark rwsem_acquire

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Date:	Mon, 7 Apr 2014 12:26:38 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <devel@...nvz.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH -mm 2/3] lockdep: mark rwsem_acquire_read as recursive

On 04/07/2014 12:13 PM, Peter Zijlstra wrote:
> On Sun, Apr 06, 2014 at 07:33:51PM +0400, Vladimir Davydov wrote:
>> rw_semaphore implementation allows recursing calls to down_read, but
>> lockdep thinks that it doesn't. As a result, it will complain
>> false-positively, e.g. if we do not observe some predefined locking
>> order when taking an rw semaphore for reading and a mutex.
>>
>> This patch makes lockdep think rw semaphore is read-recursive, just like
>> rw spin lock.
> Uhm no rwsem isn't read recursive.

Yeah, I was mistaken and is already reworking my set. Please sorry for
the noise.

Thanks.
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