linux-kernel - Re: [PATCH v8 09/16] arm64: acpi: Move get_cpu_for_acpi

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Date: Tue, 30 Apr 2024 18:37:58 +0200
From: Lorenzo Pieralisi <lpieralisi@...nel.org>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: 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>, Marc Zyngier <maz@...nel.org>,
	Hanjun Guo <guohanjun@...wei.com>, 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,
	Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v8 09/16] arm64: acpi: Move get_cpu_for_acpi_id() to a
 header

On Fri, Apr 26, 2024 at 02:51:19PM +0100, Jonathan Cameron 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>
> Acked-by: Hanjun Guo <guohanjun@...wei.com>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> ---
> v8: Picked up tags.
> ---
>  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;
> -}
> -

Apologies for the late reply.

If anything, it may make sense to squash this patch into the commit that
is actually needing it, lest we might end up with a change that is
useless if it is taken stand alone.

That's all there is to say so:

Reviewed-by: Lorenzo Pieralisi <lpieralisi@...nel.org>

>  static int __init acpi_parse_gicc_pxm(union acpi_subtable_headers *header,
>  				      const unsigned long end)
>  {
> -- 
> 2.39.2
>