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

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Date:	Mon, 7 Apr 2014 10:13:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
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 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.
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