linux-kernel - Re: [PATCH v7 09/16] arm64: acpi: Move get_cpu_for_acpi

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Date: Mon, 22 Apr 2024 11:46:39 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: 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>, Lorenzo Pieralisi
	<lpieralisi@...nel.org>, Hanjun Guo <guohanjun@...wei.com>, Sudeep Holla
	<sudeep.holla@....com>
CC: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "Dave
 Hansen" <dave.hansen@...ux.intel.com>, <justin.he@....com>,
	<jianyong.wu@....com>, <linuxarm@...wei.com>
Subject: Re: [PATCH v7 09/16] arm64: acpi: Move get_cpu_for_acpi_id() to a
 header

On Thu, 18 Apr 2024 14:54:05 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:

> From: James Morse <james.morse@....com>
> 
> 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>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Tested-by: Miguel Luis <miguel.luis@...cle.com>
> Tested-by: Vishnu Pajjuri <vishnu@...amperecomputing.com>
> Tested-by: Jianyong Wu <jianyong.wu@....com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Another one where we'd been focused on the general ACPI aspects so long
the CC list didn't include relevant maintainers.

+CC Lorenzo, Hanjun and Sudeep.


> ---
> v7: No change
> ---
>  arch/arm64/include/asm/acpi.h | 11 +++++++++++
>  arch/arm64/kernel/acpi_numa.c | 11 -----------
>  2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index 6792a1f83f2a..bc9a6656fc0c 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -119,6 +119,17 @@ 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)
>  {