From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp08.in.ibm.com (e28smtp08.in.ibm.com [122.248.162.8]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e28smtp08.in.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 2E91C2C0D45 for ; Sun, 23 Jun 2013 23:46:51 +1000 (EST) Received: from /spool/local by e28smtp08.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 23 Jun 2013 19:08:15 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp02.in.ibm.com (Postfix) with ESMTP id 4FF443940057 for ; Sun, 23 Jun 2013 19:16:48 +0530 (IST) Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5NDl1DQ22347858 for ; Sun, 23 Jun 2013 19:17:01 +0530 Received: from d28av05.in.ibm.com (loopback [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r5NDkk0s026286 for ; Sun, 23 Jun 2013 23:46:48 +1000 From: "Srivatsa S. Bhat" Subject: [PATCH 25/45] 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 Date: Sun, 23 Jun 2013 19:13:33 +0530 Message-ID: <20130623134331.19094.80396.stgit@srivatsabhat.in.ibm.com> In-Reply-To: <20130623133642.19094.16038.stgit@srivatsabhat.in.ibm.com> References: <20130623133642.19094.16038.stgit@srivatsabhat.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-arch@vger.kernel.org, devel@driverdev.osuosl.org, nikunj@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, linux-pm@vger.kernel.org, fweisbec@gmail.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, xiaoguangrong@linux.vnet.ibm.com, sbw@mit.edu, Greg Kroah-Hartman , wangyun@linux.vnet.ibm.com, srivatsa.bhat@linux.vnet.ibm.com, netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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. Cc: 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(+) 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)