linux-kernel - Re: [PATCH RFC 15/22] x86/topology: Switch over to GENERIC_CPU

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Date:   Mon, 13 Nov 2023 14:13:02 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        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,
        linux-riscv@...ts.infradead.org, kvmarm@...ts.linux.dev,
        x86@...nel.org, linux-csky@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-parisc@...r.kernel.org
Cc:     Salil Mehta <salil.mehta@...wei.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com,
        James Morse <james.morse@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RFC 15/22] x86/topology: Switch over to
 GENERIC_CPU_DEVICES

On 11/7/23 20:30, Russell King (Oracle) wrote:
> From: James Morse <james.morse@....com>
> 
> Now that GENERIC_CPU_DEVICES calls arch_register_cpu(), which can be
> overridden by the arch code, switch over to this to allow common code
> to choose when the register_cpu() call is made.
> 
> x86's struct cpus come from struct x86_cpu, which has no other members
> or users. Remove this and use the version defined by common code.
> 
> This is an intermediate step to the logic being moved to drivers/acpi,
> where GENERIC_CPU_DEVICES will do the work when booting with acpi=off.
> 
> This patch also has the effect of moving the registration of CPUs from
> subsys to driver core initialisation, prior to any initcalls running.
> 
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ----
> Changes since RFC:
>   * Fixed the second copy of arch_register_cpu() used for non-hotplug
> Changes since RFC v2:
>   * Remove duplicate of the weak generic arch_register_cpu(), spotted
>     by Jonathan Cameron. Add note about initialisation order change.
> Changes since RFC v3:
>   * Adapt to removal of EXPORT_SYMBOL()s
> ---
>   arch/x86/Kconfig           |  1 +
>   arch/x86/include/asm/cpu.h |  4 ----
>   arch/x86/kernel/topology.c | 27 ++++-----------------------
>   3 files changed, 5 insertions(+), 27 deletions(-)
> 

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