From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758024Ab2FOVGh (ORCPT ); Fri, 15 Jun 2012 17:06:37 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:49633 "EHLO e7.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757882Ab2FOVGc (ORCPT ); Fri, 15 Jun 2012 17:06:32 -0400 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, fweisbec@gmail.com, patches@linaro.org, "Paul E. McKenney" , "Paul E. McKenney" Subject: [PATCH tip/core/rcu 07/15] rcu: Move rcu_barrier_completion to rcu_state structure Date: Fri, 15 Jun 2012 14:06:02 -0700 Message-Id: <1339794370-28119-7-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.8 In-Reply-To: <1339794370-28119-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20120615210550.GA27506@linux.vnet.ibm.com> <1339794370-28119-1-git-send-email-paulmck@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12061521-5806-0000-0000-00001643FB2E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" In order to allow each RCU flavor to concurrently execute its rcu_barrier() function, it is necessary to move the relevant state to the rcu_state structure. This commit therefore moves the rcu_barrier_completion global variable to a new ->barrier_completion field in the rcu_state structure. Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney --- kernel/rcutree.c | 9 ++++----- kernel/rcutree.h | 1 + 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index d363416..a946437 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -158,7 +158,6 @@ unsigned long rcutorture_vernum; /* State information for rcu_barrier() and friends. */ static DEFINE_MUTEX(rcu_barrier_mutex); -static struct completion rcu_barrier_completion; /* * Return true if an RCU grace period is in progress. The ACCESS_ONCE()s @@ -2272,7 +2271,7 @@ static void rcu_barrier_callback(struct rcu_head *rhp) struct rcu_state *rsp = rdp->rsp; if (atomic_dec_and_test(&rsp->barrier_cpu_count)) - complete(&rcu_barrier_completion); + complete(&rsp->barrier_completion); } /* @@ -2322,7 +2321,7 @@ static void _rcu_barrier(struct rcu_state *rsp) * 6. Both rcu_barrier_callback() callbacks are invoked, awakening * us -- but before CPU 1's orphaned callbacks are invoked!!! */ - init_completion(&rcu_barrier_completion); + init_completion(&rsp->barrier_completion); atomic_set(&rsp->barrier_cpu_count, 1); raw_spin_lock_irqsave(&rsp->onofflock, flags); rsp->rcu_barrier_in_progress = current; @@ -2372,10 +2371,10 @@ static void _rcu_barrier(struct rcu_state *rsp) * CPU, and thus each counted, remove the initial count. */ if (atomic_dec_and_test(&rsp->barrier_cpu_count)) - complete(&rcu_barrier_completion); + complete(&rsp->barrier_completion); /* Wait for all rcu_barrier_callback() callbacks to be invoked. */ - wait_for_completion(&rcu_barrier_completion); + wait_for_completion(&rsp->barrier_completion); /* Other rcu_barrier() invocations can now safely proceed. */ mutex_unlock(&rcu_barrier_mutex); diff --git a/kernel/rcutree.h b/kernel/rcutree.h index e7d29b7..56fb8d4 100644 --- a/kernel/rcutree.h +++ b/kernel/rcutree.h @@ -387,6 +387,7 @@ struct rcu_state { /* Task doing rcu_barrier(), */ /* or NULL if no barrier. */ atomic_t barrier_cpu_count; /* # CPUs waiting on. */ + struct completion barrier_completion; /* Wake at barrier end. */ raw_spinlock_t fqslock; /* Only one task forcing */ /* quiescent states. */ unsigned long jiffies_force_qs; /* Time at which to invoke */ -- 1.7.8