linux-kernel - Re: [PATCH v2 1/3] ACPI / idle: Make idle_boot

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Date:	Tue, 18 Feb 2014 02:13:26 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	linux-acpi@...r.kernel.org, patches@...aro.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v2 1/3] ACPI / idle: Make idle_boot_override depend on x86 and ia64

On Saturday, February 08, 2014 09:10:16 PM Hanjun Guo wrote:
> idle_boot_override depends on x86 and ia64 now, and we can not
> foresee it will be used on ARM or ARM64,so move the code into
> CONFIG_X86 and CONFIG_IA64 #ifdefs to make processor_core.c
> can be compiled on ARM64.
> 
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  drivers/acpi/processor_core.c |   40 ++++++++++++++++++++++------------------
>  1 file changed, 22 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
> index 46583d7..01b2656 100644
> --- a/drivers/acpi/processor_core.c
> +++ b/drivers/acpi/processor_core.c
> @@ -19,24 +19,6 @@
>  #define _COMPONENT		ACPI_PROCESSOR_COMPONENT
>  ACPI_MODULE_NAME("processor_core");
>  
> -static int __init set_no_mwait(const struct dmi_system_id *id)
> -{
> -	printk(KERN_NOTICE PREFIX "%s detected - "
> -		"disabling mwait for CPU C-states\n", id->ident);
> -	boot_option_idle_override = IDLE_NOMWAIT;
> -	return 0;
> -}
> -
> -static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
> -	{
> -	set_no_mwait, "Extensa 5220", {
> -	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
> -	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
> -	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
> -	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
> -	{},
> -};
> -
>  static int map_lapic_id(struct acpi_subtable_header *entry,
>  		 u32 acpi_id, int *apic_id)
>  {
> @@ -379,13 +361,35 @@ early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
>  	return AE_OK;
>  }
>  
> +#if defined(CONFIG_X86) || defined(CONFIG_IA64)
> +static int __init set_no_mwait(const struct dmi_system_id *id)
> +{
> +	printk(KERN_NOTICE PREFIX "%s detected - "
> +		"disabling mwait for CPU C-states\n", id->ident);
> +	boot_option_idle_override = IDLE_NOMWAIT;
> +	return 0;
> +}
> +
> +static struct dmi_system_id processor_idle_dmi_table[] __initdata = {
> +	{
> +	set_no_mwait, "Extensa 5220", {
> +	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
> +	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
> +	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
> +	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
> +	{},
> +};
> +#endif
> +
>  void __init acpi_early_processor_set_pdc(void)
>  {
> +#if defined(CONFIG_X86) || defined(CONFIG_IA64)
>  	/*
>  	 * Check whether the system is DMI table. If yes, OSPM
>  	 * should not use mwait for CPU-states.
>  	 */
>  	dmi_check_system(processor_idle_dmi_table);
> +#endif

Please define processor_dmi_check() under the #if above and an empty static
inline counterpart of it for the case when the #if condition is not satisfied.
Then just call processor_dmi_check() here without the #if block in the body
of the function. 

There is a general rule to avoid preprocessor directives in function bodies.

>  
>  	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
>  			    ACPI_UINT32_MAX,
> 

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