linux-kernel - Re: [update][PATCH v3 7/7] ACPI / processor: Introduce invalid_phys

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Date:	Fri, 15 May 2015 01:58:03 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	linux-acpi@...r.kernel.org, Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [update][PATCH v3 7/7] ACPI / processor: Introduce invalid_phys_cpuid()

On Wednesday, May 13, 2015 04:19:30 PM Hanjun Guo wrote:
> Introduce invalid_phys_cpuid() to identify cpu with invalid
> physical ID, then used it as replacement of the direct comparisons
> with PHYS_CPUID_INVALID.
> 
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
> Hi Rafael,
> 
> This is replacement of patch 7/7 of patch set
> "[PATCH v3 0/7] minor cleanups for ACPI processor driver",
> which suggested by Sudeep and Lorenzo to replace 
> "(int)phys_id" < 0 with "phys_id == PHYS_CPUID_INVALID" in
> invalid_phys_cpuid().

OK

Whole series queued up for 4.2, thanks!


> 
>  drivers/acpi/acpi_processor.c | 4 ++--
>  drivers/acpi/processor_core.c | 4 ++--
>  include/linux/acpi.h          | 5 +++++
>  3 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
> index 62c846b..92a5f73 100644
> --- a/drivers/acpi/acpi_processor.c
> +++ b/drivers/acpi/acpi_processor.c
> @@ -170,7 +170,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
>  	acpi_status status;
>  	int ret;
>  
> -	if (pr->phys_id == PHYS_CPUID_INVALID)
> +	if (invalid_phys_cpuid(pr->phys_id))
>  		return -ENODEV;
>  
>  	status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
> @@ -264,7 +264,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
>  
>  	pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
>  					pr->acpi_id);
> -	if (pr->phys_id == PHYS_CPUID_INVALID)
> +	if (invalid_phys_cpuid(pr->phys_id))
>  		acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
>  
>  	pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
> index fd4140d..33a38d6 100644
> --- a/drivers/acpi/processor_core.c
> +++ b/drivers/acpi/processor_core.c
> @@ -184,7 +184,7 @@ phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
>  	phys_cpuid_t phys_id;
>  
>  	phys_id = map_mat_entry(handle, type, acpi_id);
> -	if (phys_id == PHYS_CPUID_INVALID)
> +	if (invalid_phys_cpuid(phys_id))
>  		phys_id = map_madt_entry(type, acpi_id);
>  
>  	return phys_id;
> @@ -196,7 +196,7 @@ int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
>  	int i;
>  #endif
>  
> -	if (phys_id == PHYS_CPUID_INVALID) {
> +	if (invalid_phys_cpuid(phys_id)) {
>  		/*
>  		 * On UP processor, there is no _MAT or MADT table.
>  		 * So above phys_id is always set to PHYS_CPUID_INVALID.
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 913b49f..90e4ed1e 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -163,6 +163,11 @@ static inline bool invalid_logical_cpuid(u32 cpuid)
>  	return (int)cpuid < 0;
>  }
>  
> +static inline bool invalid_phys_cpuid(phys_cpuid_t phys_id)
> +{
> +	return phys_id == PHYS_CPUID_INVALID;
> +}
> +
>  #ifdef CONFIG_ACPI_HOTPLUG_CPU
>  /* Arch dependent functions for cpu hotplug support */
>  int acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, int *pcpu);
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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