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From: Jens Axboe <axboe@kernel.dk>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
	laijs@cn.fujitsu.com, dipankar@in.ibm.com,
	akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
	josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
	peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com,
	edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com,
	oleg@redhat.com, sbw@mit.edu
Subject: Re: [PATCH tip/core/rcu 10/12] block: Substitute rcu_access_pointer() for rcu_dereference_raw()
Date: Tue, 18 Feb 2014 12:21:42 -0800	[thread overview]
Message-ID: <20140218202142.GE25515@kernel.dk> (raw)
In-Reply-To: <1392672959-6386-10-git-send-email-paulmck@linux.vnet.ibm.com>

On Mon, Feb 17 2014, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@linux.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


  reply	other threads:[~2014-02-18 20:21 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-17 21:35 [PATCH tip/core/rcu 0/12] Miscellaneous fixes for 3.15 Paul E. McKenney
2014-02-17 21:35 ` [PATCH tip/core/rcu 01/12] rcu: Add ACCESS_ONCE() to ->n_force_qs_lh accesses Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 02/12] rcu: Stop tracking FSF's postal address Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 03/12] rcu: Remove ACCESS_ONCE() from jiffies Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 04/12] rcu: Glue ASCII strings together Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 05/12] rcu: Indentation and spacing fixes Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 06/12] rcu: Define rcu_assign_pointer() in terms of smp_store_release() Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 07/12] rcu: Disambiguate CONFIG_RCU_NOCB_CPUs Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 08/12] rcu: Move SRCU grace period work to power efficient workqueue Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 09/12] fs: Substitute rcu_access_pointer() for rcu_dereference_raw() Paul E. McKenney
2014-02-17 22:00     ` Josh Triplett
2014-02-17 23:05       ` Paul E. McKenney
2014-02-18  0:04         ` Josh Triplett
2014-02-18  0:27           ` Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 10/12] block: " Paul E. McKenney
2014-02-18 20:21     ` Jens Axboe [this message]
2014-02-17 21:35   ` [PATCH tip/core/rcu 11/12] notifier: " Paul E. McKenney
2014-02-17 21:35   ` [PATCH tip/core/rcu 12/12] rcu: Fix sparse warning for rcu_expedited from kernel/ksysfs.c Paul E. McKenney
2014-02-17 22:01 ` [PATCH tip/core/rcu 0/12] Miscellaneous fixes for 3.15 Josh Triplett

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