From patchwork Wed Oct 21 11:53:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 7456391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 6F67C9F1C3 for ; Wed, 21 Oct 2015 11:56:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8F9502065A for ; Wed, 21 Oct 2015 11:56:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 91FAF2062E for ; Wed, 21 Oct 2015 11:56:05 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZoryL-000279-DC; Wed, 21 Oct 2015 11:54:25 +0000 Received: from smtp02.citrix.com ([66.165.176.63]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZoryH-0001l7-ST for linux-arm-kernel@lists.infradead.org; Wed, 21 Oct 2015 11:54:23 +0000 X-IronPort-AV: E=Sophos;i="5.17,711,1437436800"; d="scan'208";a="311878882" From: Stefano Stabellini To: Subject: [PATCH v4 2/3] xen, cpu_hotplug: call device_offline instead of cpu_down Date: Wed, 21 Oct 2015 12:53:49 +0100 Message-ID: <1445428430-21567-2-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-DLP: MIA1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151021_045422_203147_250F2859 X-CRM114-Status: UNSURE ( 9.75 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -4.2 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, david.vrabel@citrix.com, linux-arm-kernel@lists.infradead.org, Stefano Stabellini Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 When offlining a cpu, instead of cpu_down, call device_offline, which also takes care of updating the cpu.dev.offline field. This keeps the sysfs file /sys/devices/system/cpu/cpuN/online, up to date. Also move the call to disable_hotplug_cpu, because it makes more sense to have it there. We don't call device_online at cpu-hotplug time, because that would immediately take the cpu online, while we want to retain the current behaviour: the user needs to explicitly enable the cpu after it has been hotplugged. Signed-off-by: Stefano Stabellini CC: konrad.wilk@oracle.com CC: boris.ostrovsky@oracle.com CC: david.vrabel@citrix.com Reviewed-by: Boris Ostrovsky --- Changes in v4: - protect device_offline with lock/unlock_device_hotplug - improve commit message --- drivers/xen/cpu_hotplug.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c index 43de1f5..5676aef 100644 --- a/drivers/xen/cpu_hotplug.c +++ b/drivers/xen/cpu_hotplug.c @@ -18,6 +18,11 @@ static void enable_hotplug_cpu(int cpu) static void disable_hotplug_cpu(int cpu) { + if (cpu_online(cpu)) { + lock_device_hotplug(); + device_offline(get_cpu_device(cpu)); + unlock_device_hotplug(); + } if (cpu_present(cpu)) xen_arch_unregister_cpu(cpu); @@ -55,7 +60,6 @@ static void vcpu_hotplug(unsigned int cpu) enable_hotplug_cpu(cpu); break; case 0: - (void)cpu_down(cpu); disable_hotplug_cpu(cpu); break; default: