From patchwork Thu Jun 27 19:57:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Srivatsa S. Bhat" X-Patchwork-Id: 2795141 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 854ECBF4A1 for ; Thu, 27 Jun 2013 20:00:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4F31220253 for ; Thu, 27 Jun 2013 20:00:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F61520270 for ; Thu, 27 Jun 2013 20:00:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754845Ab3F0UAr (ORCPT ); Thu, 27 Jun 2013 16:00:47 -0400 Received: from e28smtp01.in.ibm.com ([122.248.162.1]:49578 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754879Ab3F0UAi (ORCPT ); Thu, 27 Jun 2013 16:00:38 -0400 Received: from /spool/local by e28smtp01.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 28 Jun 2013 01:23:34 +0530 Received: from d28dlp03.in.ibm.com (9.184.220.128) by e28smtp01.in.ibm.com (192.168.1.131) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Fri, 28 Jun 2013 01:23:30 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id 625361258051; Fri, 28 Jun 2013 01:29:36 +0530 (IST) Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5RK0hoa15401044; Fri, 28 Jun 2013 01:30:43 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r5RK0Jpn006858; Thu, 27 Jun 2013 20:00:24 GMT Received: from srivatsabhat.in.ibm.com ([9.79.209.72]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r5RK0HBc006644; Thu, 27 Jun 2013 20:00:17 GMT From: "Srivatsa S. Bhat" Subject: [PATCH v3 26/45] staging/octeon: Use get/put_online_cpus_atomic() to prevent CPU offline To: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org, oleg@redhat.com, paulmck@linux.vnet.ibm.com, rusty@rustcorp.com.au, mingo@kernel.org, akpm@linux-foundation.org, namhyung@kernel.org, walken@google.com, vincent.guittot@linaro.org, laijs@cn.fujitsu.com, David.Laight@aculab.com Cc: rostedt@goodmis.org, wangyun@linux.vnet.ibm.com, xiaoguangrong@linux.vnet.ibm.com, sbw@mit.edu, fweisbec@gmail.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, srivatsa.bhat@linux.vnet.ibm.com, linux-pm@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, David Daney , Greg Kroah-Hartman , devel@driverdev.osuosl.org, "Srivatsa S. Bhat" Date: Fri, 28 Jun 2013 01:27:03 +0530 Message-ID: <20130627195703.29830.98304.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20130627195136.29830.10445.stgit@srivatsabhat.in.ibm.com> References: <20130627195136.29830.10445.stgit@srivatsabhat.in.ibm.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13062719-4790-0000-0000-00000902E09E Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-8.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Once stop_machine() is gone from the CPU offline path, we won't be able to depend on disabling preemption to prevent CPUs from going offline from under us. Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Acked-by: David Daney Acked-by: Greg Kroah-Hartman Cc: devel@driverdev.osuosl.org Signed-off-by: Srivatsa S. Bhat --- drivers/staging/octeon/ethernet-rx.c | 3 +++ 1 file changed, 3 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/staging/octeon/ethernet-rx.c b/drivers/staging/octeon/ethernet-rx.c index 34afc16..8588b4d 100644 --- a/drivers/staging/octeon/ethernet-rx.c +++ b/drivers/staging/octeon/ethernet-rx.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include #ifdef CONFIG_XFRM @@ -97,6 +98,7 @@ static void cvm_oct_enable_one_cpu(void) return; /* ... if a CPU is available, Turn on NAPI polling for that CPU. */ + get_online_cpus_atomic(); for_each_online_cpu(cpu) { if (!cpu_test_and_set(cpu, core_state.cpu_state)) { v = smp_call_function_single(cpu, cvm_oct_enable_napi, @@ -106,6 +108,7 @@ static void cvm_oct_enable_one_cpu(void) break; } } + put_online_cpus_atomic(); } static void cvm_oct_no_more_work(void)