Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH RFC 0/3] Support CPU hotplug for ARM64
To:     <rjw@rjwysocki.net>, <catalin.marinas@arm.com>,
        <james.morse@arm.com>
CC:     <linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <guohanjun@huawei.com>,
        <xiexiuqi@huawei.com>, <huawei.libin@huawei.com>,
        <john.garry@huawei.com>, <jonathan.cameron@huawei.com>
References: <1561720392-45907-1-git-send-email-wangxiongfeng2@huawei.com>
From:   Xiongfeng Wang <wangxiongfeng2@huawei.com>
Message-ID: <74bda3c2-e706-aa3b-441a-fb85e2a5c778@huawei.com>
Date:   Sat, 29 Jun 2019 10:07:10 +0800
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.6.0
MIME-Version: 1.0
In-Reply-To: <1561720392-45907-1-git-send-email-wangxiongfeng2@huawei.com>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Sorry, the third patch can't be applied to the lastest kernel. I will send another
version and attach the method to test this patchset.

On 2019/6/28 19:13, Xiongfeng Wang wrote:
> This patchset mark all the GICC node in MADT as possible CPUs even though it
> is disabled. But only those enabled GICC node are marked as present CPUs.
> So that kernel will initialize some CPU related data structure in advance before
> the CPU is actually hot added into the system. This patchset also implement 
> 'acpi_(un)map_cpu()' and 'arch_(un)register_cpu()' for ARM64. These functions are
> needed to enable CPU hotplug.
> 
> To support CPU hotplug, we need to add all the possible GICC node in MADT
> including those CPUs that are not present but may be hot added later. Those
> CPUs are marked as disabled in GICC nodes.
> 
> Xiongfeng Wang (3):
>   ACPI / scan: evaluate _STA for processors declared via ASL Device
>     statement
>   arm64: mark all the GICC nodes in MADT as possible cpu
>   arm64: Add CPU hotplug support
> 
>  arch/arm64/kernel/acpi.c  | 22 ++++++++++++++++++++++
>  arch/arm64/kernel/setup.c | 19 ++++++++++++++++++-
>  arch/arm64/kernel/smp.c   | 11 +++++------
>  drivers/acpi/scan.c       | 12 ++++++++++++
>  4 files changed, 57 insertions(+), 7 deletions(-)
>