Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752031AbaJTD3S (ORCPT ); Sun, 19 Oct 2014 23:29:18 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:11634 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750807AbaJTD3Q (ORCPT ); Sun, 19 Oct 2014 23:29:16 -0400 From: Neil Zhang To: , CC: Neil Zhang Subject: [PATCH] drivers: base: update cpu offline info when do hotplug Date: Mon, 20 Oct 2014 11:29:08 +0800 Message-ID: <1413775748-22478-1-git-send-email-zhangwm@marvell.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.12.52,1.0.28,0.0.0000 definitions=2014-10-19_03:2014-10-17,2014-10-19,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1410200037 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current per-cpu offline info won't be updated if it is hotplugged in/out by a kernel governer. Let's update it via cpu notifier. Signed-off-by: Neil Zhang --- drivers/base/cpu.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 006b1bc..9d61824 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -418,10 +418,35 @@ static void __init cpu_dev_register_generic(void) #endif } +static int device_hotplug_notifier(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + struct device *dev = get_cpu_device(cpu); + int ret; + + switch (action & ~CPU_TASKS_FROZEN) { + case CPU_ONLINE: + dev->offline = false; + ret = NOTIFY_OK; + break; + case CPU_DYING: + dev->offline = true; + ret = NOTIFY_OK; + break; + default: + ret = NOTIFY_DONE; + break; + } + + return ret; +} + void __init cpu_dev_init(void) { if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) panic("Failed to register CPU subsystem"); cpu_dev_register_generic(); + cpu_notifier(device_hotplug_notifier, 0); } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/