linux-kernel - Re: [RFC PATCH v2 26/35] arm64: acpi: Move get_cpu_for_acpi

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Message-ID: <9ef55959-66f3-0dc3-dec8-e2b673f965a4@redhat.com>
Date:   Tue, 19 Sep 2023 11:16:40 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     James Morse <james.morse@....com>, 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
Cc:     x86@...nel.org, Salil Mehta <salil.mehta@...wei.com>,
        Russell King <linux@...linux.org.uk>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        jianyong.wu@....com, justin.he@....com
Subject: Re: [RFC PATCH v2 26/35] arm64: acpi: Move get_cpu_for_acpi_id() to a
 header


On 9/14/23 02:38, James Morse wrote:
> ACPI identifies CPUs by UID. get_cpu_for_acpi_id() maps the ACPI UID
> to the linux CPU number.
> 
> The helper to retrieve this mapping is only available in arm64's numa
> code.
> 
> Move it to live next to get_acpi_id_for_cpu().
> 
> Signed-off-by: James Morse <james.morse@....com>
> ---
>   arch/arm64/include/asm/acpi.h | 11 +++++++++++
>   arch/arm64/kernel/acpi_numa.c | 11 -----------
>   2 files changed, 11 insertions(+), 11 deletions(-)
> 

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

> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index 4d537d56eb84..ce5045038e87 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -100,6 +100,17 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
>   	return	acpi_cpu_get_madt_gicc(cpu)->uid;
>   }
>   
> +static inline int get_cpu_for_acpi_id(u32 uid)
> +{
> +	int cpu;
> +
> +	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
> +		if (uid == get_acpi_id_for_cpu(cpu))
> +			return cpu;
> +
> +	return -EINVAL;
> +}
> +
>   static inline void arch_fix_phys_package_id(int num, u32 slot) { }
>   void __init acpi_init_cpus(void);
>   int apei_claim_sea(struct pt_regs *regs);
> diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c
> index e51535a5f939..0c036a9a3c33 100644
> --- a/arch/arm64/kernel/acpi_numa.c
> +++ b/arch/arm64/kernel/acpi_numa.c
> @@ -34,17 +34,6 @@ int __init acpi_numa_get_nid(unsigned int cpu)
>   	return acpi_early_node_map[cpu];
>   }
>   
> -static inline int get_cpu_for_acpi_id(u32 uid)
> -{
> -	int cpu;
> -
> -	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
> -		if (uid == get_acpi_id_for_cpu(cpu))
> -			return cpu;
> -
> -	return -EINVAL;
> -}
> -
>   static int __init acpi_parse_gicc_pxm(union acpi_subtable_headers *header,
>   				      const unsigned long end)
>   {