From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752877AbbJFRX5 (ORCPT ); Tue, 6 Oct 2015 13:23:57 -0400 Received: from relay4-d.mail.gandi.net ([217.70.183.196]:36543 "EHLO relay4-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751812AbbJFRX4 (ORCPT ); Tue, 6 Oct 2015 13:23:56 -0400 Date: Tue, 6 Oct 2015 10:23:51 -0700 From: Josh Triplett To: "Paul E. McKenney" Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.4 Message-ID: <20151006172351.GF9600@cloud> References: <20151006161305.GA9799@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151006161305.GA9799@linux.vnet.ibm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 06, 2015 at 09:13:05AM -0700, Paul E. McKenney wrote: > Hello! > > This series contains miscellaneous fixes: > > 1. Export sched_setscheduler_nocheck() so that the new locktorture > rtmutex_lock tests can be run as modules, courtesy of Davidlohr > Bueso. > > 2. Use rcu_callback_t in call_rcu*() and friends to improve > readability and to make cscope able to find them, courtesy of > Boqun Feng. > > 3. Use call_rcu_func_t to replace explicit type equivalents when > defining RCU callback functions, courtesy of Boqun Feng. > > 4. Don't unnecessarily disable preemption for Tiny and Tree > RCU readers (only for preemptible RCU readers), courtesy > of Boqun Feng. > > 5. Eliminate boot-time panic when a silly boot-time fanout is > specified. > > 6. Add online/offline info to help debug stall-warning messages. > > 7. Move preemption disabling out of __srcu_read_lock() into > srcu_read_lock(). > > 8. Finish folding ->fqs_state into ->gp_state, courtesy of Petr Mladek. > > 9. Correct comment for values of ->gp_state field. > > 10. Add rcu_pointer_handoff() to allow explicit marking of handing > off protection from RCU to some other means, such as locking > or reference counting. > > 11. Make list_entry_rcu() use lockless_dereference(), courtesy > of Patrick Marlier. Despite the fact that this patch > does nothing more than eliminate a single store and a > single load of an unshared stack variable it nevertheless > manages to provide a measurable performance increase: > http://people.csail.mit.edu/amatveev/RLU_SOSP2015.pdf > > 12. Remove deprecated rcu_lockdep_assert(). (And a patch 13 not mentioned here.) I responded to patches 4, 6, and 10 with feedback; for the rest (and for those with the issues addressed): Reviewed-by: Josh Triplett