linux-kernel - Re: [PATCH RFC 0/3] Support CPU hotplug for ARM64

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Message-ID: <74bda3c2-e706-aa3b-441a-fb85e2a5c778@huawei.com>
Date:   Sat, 29 Jun 2019 10:07:10 +0800
From:   Xiongfeng Wang <wangxiongfeng2@...wei.com>
To:     <rjw@...ysocki.net>, <catalin.marinas@....com>,
        <james.morse@....com>
CC:     <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <guohanjun@...wei.com>,
        <xiexiuqi@...wei.com>, <huawei.libin@...wei.com>,
        <john.garry@...wei.com>, <jonathan.cameron@...wei.com>
Subject: Re: [PATCH RFC 0/3] Support CPU hotplug for ARM64

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(-)
>