From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp04.au.ibm.com (e23smtp04.au.ibm.com [202.81.31.146]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e23smtp04.au.ibm.com", Issuer "GeoTrust SSL CA" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 1577E2C06BA for ; Fri, 28 Jun 2013 06:03:52 +1000 (EST) Received: from /spool/local by e23smtp04.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 28 Jun 2013 05:49:16 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 724E63578052 for ; Fri, 28 Jun 2013 06:03:49 +1000 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5RJmmPx8454476 for ; Fri, 28 Jun 2013 05:48:48 +1000 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r5RK3ks1023078 for ; Fri, 28 Jun 2013 06:03:48 +1000 From: "Srivatsa S. Bhat" Subject: [PATCH v3 42/45] powerpc: Use get/put_online_cpus_atomic() to avoid false-positive warning 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 Date: Fri, 28 Jun 2013 01:30:18 +0530 Message-ID: <20130627200017.29830.7532.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> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-arch@vger.kernel.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, Paul Mackerras , wangyun@linux.vnet.ibm.com, "Srivatsa S. Bhat" , netdev@vger.kernel.org, Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Zhao Chenhui List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Bringing a secondary CPU online is a special case in which, accessing the cpu_online_mask is safe, even though that task (which running on the CPU coming online) is not the hotplug writer. It is a little hard to teach this to the debugging checks under CONFIG_DEBUG_HOTPLUG_CPU. But luckily powerpc is one of the few places where the CPU coming online traverses the cpu_online_mask before fully coming online. So wrap that part under get/put_online_cpus_atomic(), to avoid false-positive warnings from the CPU hotplug debug code. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Kumar Gala Cc: Zhao Chenhui Cc: Thomas Gleixner Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Srivatsa S. Bhat --- arch/powerpc/kernel/smp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 2123bec..59c9a09 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -657,6 +657,7 @@ __cpuinit void start_secondary(void *unused) cpumask_set_cpu(base + i, cpu_core_mask(cpu)); } l2_cache = cpu_to_l2cache(cpu); + get_online_cpus_atomic(); for_each_online_cpu(i) { struct device_node *np = cpu_to_l2cache(i); if (!np) @@ -667,6 +668,7 @@ __cpuinit void start_secondary(void *unused) } of_node_put(np); } + put_online_cpus_atomic(); of_node_put(l2_cache); local_irq_enable();