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Message-ID: <0ec78ec2-636d-c7b1-4265-7cffa88765e1@huawei.com>
Date: Tue, 23 Apr 2024 14:18:04 +0800
From: Hanjun Guo <guohanjun@...wei.com>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>, Thomas Gleixner
<tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>,
<linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
<linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<kvmarm@...ts.linux.dev>, <x86@...nel.org>, Russell King
<linux@...linux.org.uk>, "Rafael J . Wysocki" <rafael@...nel.org>, Miguel
Luis <miguel.luis@...cle.com>, James Morse <james.morse@....com>, Salil Mehta
<salil.mehta@...wei.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
CC: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
Hansen <dave.hansen@...ux.intel.com>, <linuxarm@...wei.com>,
<justin.he@....com>, <jianyong.wu@....com>
Subject: Re: [PATCH v7 01/16] ACPI: processor: Simplify initial onlining to
use same path for cold and hotplug
On 2024/4/18 21:53, Jonathan Cameron wrote:
> Separate code paths, combined with a flag set in acpi_processor.c to
> indicate a struct acpi_processor was for a hotplugged CPU ensured that
> per CPU data was only set up the first time that a CPU was initialized.
> This appears to be unnecessary as the paths can be combined by letting
> the online logic also handle any CPUs online at the time of driver load.
>
> Motivation for this change, beyond simplification, is that ARM64
> virtual CPU HP uses the same code paths for hotplug and cold path in
> acpi_processor.c so had no easy way to set the flag for hotplug only.
> Removing this necessity will enable ARM64 vCPU HP to reuse the existing
> code paths.
>
> Leave noisy pr_info() in place but update it to not state the CPU
> was hotplugged.
>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>
> ---
> v7: No change.
> v6: New patch.
> RFT: I have very limited test resources for x86 and other
> architectures that may be affected by this change.
> ---
> drivers/acpi/acpi_processor.c | 1 -
> drivers/acpi/processor_driver.c | 44 ++++++++++-----------------------
> include/acpi/processor.h | 2 +-
> 3 files changed, 14 insertions(+), 33 deletions(-)
Nice simplification,
Reviewed-by: Hanjun Guo <guohanjun@...wei.com>
Thanks
Hanjun
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