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Message-ID: <114fcd7e-33e3-4741-936f-21b0576c59e4@redhat.com>
Date: Wed, 1 May 2024 21:13:46 +1000
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Subject: Re: [PATCH v9 17/19] arm64: Kconfig: Enable hotplug CPU on arm64 if
 ACPI_PROCESSOR is enabled.
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To: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
 Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>,
 linux-pm@vger.kernel.org, loongarch@lists.linux.dev,
 linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 kvmarm@lists.linux.dev, x86@kernel.org, Russell King
 <linux@armlinux.org.uk>, "Rafael J . Wysocki" <rafael@kernel.org>,
 Miguel Luis <miguel.luis@oracle.com>, James Morse <james.morse@arm.com>,
 Salil Mehta <salil.mehta@huawei.com>,
 Jean-Philippe Brucker <jean-philippe@linaro.org>,
 Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>,
 Marc Zyngier <maz@kernel.org>, Hanjun Guo <guohanjun@huawei.com>
Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
 Dave Hansen <dave.hansen@linux.intel.com>, linuxarm@huawei.com,
 justin.he@arm.com, jianyong.wu@arm.com
References: <20240430142434.10471-1-Jonathan.Cameron@huawei.com>
 <20240430142434.10471-18-Jonathan.Cameron@huawei.com>
From: Gavin Shan <gshan@redhat.com>
In-Reply-To: <20240430142434.10471-18-Jonathan.Cameron@huawei.com>
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On 5/1/24 00:24, Jonathan Cameron wrote:
> In order to move arch_register_cpu() to be called via the same path
> for initially present CPUs described by ACPI and hotplugged CPUs
> ACPI_HOTPLUG_CPU needs to be enabled.
> 
> The protection against invalid IDs in acpi_map_cpu() is needed as
> at least one production BIOS is in the wild which reports entries
> in DSDT (with no _STA method, so assumed enabled and present)
> that don't match MADT.
> 
> Tested-by: Miguel Luis <miguel.luis@oracle.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
> ---
> V9: No change.
> 
> ---
>   arch/arm64/Kconfig       |  1 +
>   arch/arm64/kernel/acpi.c | 22 ++++++++++++++++++++++
>   2 files changed, 23 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@redhat.com>