linux-kernel - Re: [PATCH tip/core/rcu 54/55] rcu: Make srcu_read_lock_held() call common lockdep-enabled function

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Message-ID: <20111017020309.GI19421@leaf>
Date:	Sun, 16 Oct 2011 19:03:10 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 54/55] rcu: Make srcu_read_lock_held() call
 common lockdep-enabled function

On Tue, Sep 06, 2011 at 11:00:48AM -0700, Paul E. McKenney wrote:
> A common debug_lockdep_rcu_enabled() function is used to check whether
> RCU lockdep splats should be reported, but srcu_read_lock() does not
> use it.  This commit therefore brings srcu_read_lock_held() up to date.

Should this patch go before 53, or merge into 53, to prevent the issues
you describe from occuring in a tree which has 53 applied but not 54?

- Josh Triplett
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