From patchwork Fri Jun 22 15:34:57 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 9580 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 15C9323E37 for ; Fri, 22 Jun 2012 15:37:59 +0000 (UTC) Received: from mail-gg0-f180.google.com (mail-gg0-f180.google.com [209.85.161.180]) by fiordland.canonical.com (Postfix) with ESMTP id DA5D4A18268 for ; Fri, 22 Jun 2012 15:37:58 +0000 (UTC) Received: by mail-gg0-f180.google.com with SMTP id f1so1758124ggn.11 for ; Fri, 22 Jun 2012 08:37:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-forwarded-to:x-forwarded-for:delivered-to:received-spf:from:to:cc :subject:date:message-id:x-mailer:in-reply-to:references :x-content-scanned:x-cbid:x-gm-message-state; bh=JaBYGOC4J2xnr32sgqP+7NMQt5We7Jb053QOwH1Any0=; b=IKsvL7+4db6A6lok5RQP545OcSt84Mheb21ar0FpA8xWlVU+FFGdgWAF18gdFRF5RJ DgA8g9wsk95hHuTJI6SS6w1ZWQJvZ3YE7PhXhmypgMlop14QXhSvW8kpy2tDzQo5+xip 2ChKaZWgjALbYDUc+UzjuuVhPeiZGoruj68o3xq469u9nUXTPi+NHrRutObcUp42nsQF 2aUdC2VXZoaIEa6FdBul72TA9dThXqtiYtvH4m7UpEFI8w0fL2iYOh63mrXRCQTumNmp yy9AuR3WPv4d728V8lZUmC4GLK68lQF1A9spMKRscH67Vl2FKUpTMfR1ADkPt7s+gdHn U89g== Received: by 10.50.193.196 with SMTP id hq4mr2123329igc.57.1340379478475; Fri, 22 Jun 2012 08:37:58 -0700 (PDT) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.231.24.148 with SMTP id v20csp72503ibb; Fri, 22 Jun 2012 08:37:57 -0700 (PDT) Received: by 10.68.191.72 with SMTP id gw8mr10928585pbc.143.1340379477725; Fri, 22 Jun 2012 08:37:57 -0700 (PDT) Received: from e33.co.us.ibm.com (e33.co.us.ibm.com. [32.97.110.151]) by mx.google.com with ESMTPS id vv4si10019740pbc.342.2012.06.22.08.37.57 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 22 Jun 2012 08:37:57 -0700 (PDT) Received-SPF: pass (google.com: domain of paulmck@linux.vnet.ibm.com designates 32.97.110.151 as permitted sender) client-ip=32.97.110.151; Authentication-Results: mx.google.com; spf=pass (google.com: domain of paulmck@linux.vnet.ibm.com designates 32.97.110.151 as permitted sender) smtp.mail=paulmck@linux.vnet.ibm.com Received: from /spool/local by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 22 Jun 2012 09:37:56 -0600 Received: from d03dlp03.boulder.ibm.com (9.17.202.179) by e33.co.us.ibm.com (192.168.1.133) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Fri, 22 Jun 2012 09:37:54 -0600 Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id 101AC19D804E; Fri, 22 Jun 2012 15:36:15 +0000 (WET) Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5MFZZFo150346; Fri, 22 Jun 2012 09:35:53 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5MFZFbg023079; Fri, 22 Jun 2012 09:35:16 -0600 Received: from paulmck-ThinkPad-W500 ([9.47.24.152]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id q5MFZEYq023054; Fri, 22 Jun 2012 09:35:15 -0600 Received: by paulmck-ThinkPad-W500 (Postfix, from userid 1000) id AE696E526A; Fri, 22 Jun 2012 08:35:14 -0700 (PDT) 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, sbw@mit.edu, patches@linaro.org, "Paul E. McKenney" , "Paul E. McKenney" Subject: [PATCH tip/core/rcu 02/17] rcu: Consolidate duplicate callback-list initialization Date: Fri, 22 Jun 2012 08:34:57 -0700 Message-Id: <1340379312-6684-2-git-send-email-paulmck@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.8 In-Reply-To: <1340379312-6684-1-git-send-email-paulmck@linux.vnet.ibm.com> References: <20120622153501.GA6626@linux.vnet.ibm.com> <1340379312-6684-1-git-send-email-paulmck@linux.vnet.ibm.com> X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12062215-2398-0000-0000-000007C71CFC X-Gm-Message-State: ALoCoQmGQRGh0usm5GkCwjvg1TP+o0Az79bs9VrJwGza5O65l7g+oJCckr2b5rSI9Tx4J+Upteot From: "Paul E. McKenney" There are a couple of open-coded initializations of the rcu_data structure's RCU callback list. This commit therefore consolidates them into a new init_callback_list() function. Signed-off-by: Paul E. McKenney Signed-off-by: Paul E. McKenney Reviewed-by: Josh Triplett --- kernel/rcutree.c | 23 ++++++++++++++--------- 1 files changed, 14 insertions(+), 9 deletions(-) diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 0f04480..d938671 100644 --- a/kernel/rcutree.c +++ b/kernel/rcutree.c @@ -936,6 +936,18 @@ check_for_new_grace_period(struct rcu_state *rsp, struct rcu_data *rdp) } /* + * Initialize the specified rcu_data structure's callback list to empty. + */ +static void init_callback_list(struct rcu_data *rdp) +{ + int i; + + rdp->nxtlist = NULL; + for (i = 0; i < RCU_NEXT_SIZE; i++) + rdp->nxttail[i] = &rdp->nxtlist; +} + +/* * Advance this CPU's callbacks, but only if the current grace period * has ended. This may be called only from the CPU to whom the rdp * belongs. In addition, the corresponding leaf rcu_node structure's @@ -1327,8 +1339,6 @@ static void rcu_send_cbs_to_orphanage(int cpu, struct rcu_state *rsp, struct rcu_node *rnp, struct rcu_data *rdp) { - int i; - /* * Orphan the callbacks. First adjust the counts. This is safe * because ->onofflock excludes _rcu_barrier()'s adoption of @@ -1368,9 +1378,7 @@ rcu_send_cbs_to_orphanage(int cpu, struct rcu_state *rsp, } /* Finally, initialize the rcu_data structure's list to empty. */ - rdp->nxtlist = NULL; - for (i = 0; i < RCU_NEXT_SIZE; i++) - rdp->nxttail[i] = &rdp->nxtlist; + init_callback_list(rdp); } /* @@ -2404,16 +2412,13 @@ static void __init rcu_boot_init_percpu_data(int cpu, struct rcu_state *rsp) { unsigned long flags; - int i; struct rcu_data *rdp = per_cpu_ptr(rsp->rda, cpu); struct rcu_node *rnp = rcu_get_root(rsp); /* Set up local state, ensuring consistent view of global state. */ raw_spin_lock_irqsave(&rnp->lock, flags); rdp->grpmask = 1UL << (cpu - rdp->mynode->grplo); - rdp->nxtlist = NULL; - for (i = 0; i < RCU_NEXT_SIZE; i++) - rdp->nxttail[i] = &rdp->nxtlist; + init_callback_list(rdp); rdp->qlen_lazy = 0; rdp->qlen = 0; rdp->dynticks = &per_cpu(rcu_dynticks, cpu);