Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932336AbWEHFsm (ORCPT ); Mon, 8 May 2006 01:48:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932333AbWEHFsF (ORCPT ); Mon, 8 May 2006 01:48:05 -0400 Received: from mga02.intel.com ([134.134.136.20]:22651 "EHLO orsmga101-1.jf.intel.com") by vger.kernel.org with ESMTP id S932331AbWEHFr1 (ORCPT ); Mon, 8 May 2006 01:47:27 -0400 X-IronPort-AV: i="4.05,99,1146466800"; d="scan'208"; a="32948579:sNHT772745113" Subject: [PATCH 10/10] cpu bulk removal interface From: Shaohua Li To: lkml Cc: Ashok Raj , Andrew Morton Content-Type: text/plain Date: Mon, 08 May 2006 13:45:58 +0800 Message-Id: <1147067158.2760.90.camel@sli10-desk.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 (2.2.2-5) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2712 Lines: 91 Interface for bulk cpu removal. It's /sys/devices/system/cpu/cpu_bulk_remove Signed-off-by: Shaohua Li --- linux-2.6.17-rc3-root/drivers/base/cpu.c | 47 +++++++++++++++++++++++++++++- linux-2.6.17-rc3-root/include/linux/cpu.h | 3 + 2 files changed, 49 insertions(+), 1 deletion(-) diff -puN drivers/base/cpu.c~bulk_cpu_remove_interface drivers/base/cpu.c --- linux-2.6.17-rc3/drivers/base/cpu.c~bulk_cpu_remove_interface 2006-05-07 07:47:02.000000000 +0800 +++ linux-2.6.17-rc3-root/drivers/base/cpu.c 2006-05-07 09:29:54.000000000 +0800 @@ -76,6 +76,46 @@ static inline void register_cpu_control( } #endif /* CONFIG_HOTPLUG_CPU */ +#ifdef CONFIG_BULK_CPU_REMOVE +static ssize_t cpu_bulk_remove_show(struct sysdev_class *c, char *buf) +{ + int len; + + len = cpulist_scnprintf(buf, PAGE_SIZE-1, cpu_online_map); + len += sprintf(buf + len, "\n"); + return len; +} + +static ssize_t cpu_bulk_remove_store(struct sysdev_class *c, + const char *buf, size_t count) +{ + int err; + cpumask_t removed_cpus; + + if ((err = lock_cpu_hotplug_interruptible() != 0)) + return err; + err = cpulist_parse(buf, removed_cpus); + if (err) { + unlock_cpu_hotplug(); + return err; + } + + unlock_cpu_hotplug(); + cpu_down_mask(removed_cpus); + return count; +} + +static SYSDEV_CLASS_ATTR(cpu_bulk_remove, 0600, cpu_bulk_remove_show, + cpu_bulk_remove_store); + +void __init cpu_bulk_remove_sysfs_init(void) +{ + sysdev_class_create_file(&cpu_sysdev_class, &attr_cpu_bulk_remove); +} +#else +#define cpu_bulk_remove_sysfs_init() +#endif + #ifdef CONFIG_KEXEC #include @@ -145,5 +185,10 @@ EXPORT_SYMBOL_GPL(get_cpu_sysdev); int __init cpu_dev_init(void) { - return sysdev_class_register(&cpu_sysdev_class); + int ret; + + ret = sysdev_class_register(&cpu_sysdev_class); + if (!ret) + cpu_bulk_remove_sysfs_init(); + return ret; } diff -puN include/linux/cpu.h~bulk_cpu_remove_interface include/linux/cpu.h --- linux-2.6.17-rc3/include/linux/cpu.h~bulk_cpu_remove_interface 2006-05-07 07:47:02.000000000 +0800 +++ linux-2.6.17-rc3-root/include/linux/cpu.h 2006-05-07 07:47:02.000000000 +0800 @@ -74,6 +74,9 @@ extern int lock_cpu_hotplug_interruptibl register_cpu_notifier(&fn##_nb); \ } int cpu_down(unsigned int cpu); +#ifdef CONFIG_BULK_CPU_REMOVE +int cpu_down_mask(cpumask_t remove_mask); +#endif #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) #else #define lock_cpu_hotplug() do { } while (0) _ - 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/