Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752121AbaJ0C7M (ORCPT ); Sun, 26 Oct 2014 22:59:12 -0400 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:43343 "EHLO mx0a-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751984AbaJ0C7L (ORCPT ); Sun, 26 Oct 2014 22:59:11 -0400 From: Neil Zhang To: CC: , Neil Zhang , "Rafael J. Wysocki" Subject: [PATCH V2] Driver cpu: update online when cpu_up/down besides sysfs Date: Mon, 27 Oct 2014 10:59:08 +0800 Message-ID: <1414378748-8855-1-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=2014-10-27_01:2014-10-24,2014-10-26,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1410270034 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 when we use any other method besides sysfs to call cpu_up/down. Thus the cpu/online can't reflect the real online status. This patch is going to fix the issue introduced by commit 0902a9044fa5b7a0456ea4daacec2c2b3189ba8c (Driver core: Use generic offline/online for CPU offline/online) CC: Rafael J. Wysocki Tested-by: Dan Streetman 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/