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Date:	Mon, 7 Apr 2014 10:13:36 +0200
From:	Peter Zijlstra <>
To:	Vladimir Davydov <>
	Ingo Molnar <>
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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