linux-kernel - Re: [PATCH tip/core/rcu 10/12] block: Substitute rcu_access_pointer() for rcu_dereference

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Message-ID: <20140218202142.GE25515@kernel.dk>
Date:	Tue, 18 Feb 2014 12:21:42 -0800
From:	Jens Axboe <axboe@...nel.dk>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 10/12] block: Substitute
 rcu_access_pointer() for rcu_dereference_raw()

On Mon, Feb 17 2014, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> (Trivial patch.)
> 
> If the code is looking at the RCU-protected pointer itself, but not
> dereferencing it, the rcu_dereference() functions can be downgraded to
> rcu_access_pointer().  This commit makes this downgrade in blkg_destroy()
> and ioc_destroy_icq(), both of which simply compare the RCU-protected
> pointer against another pointer with no dereferencing.

Thanks Paul, applied.

-- 
Jens Axboe

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