linux-kernel - Re: [RFC Patch 16/19] ACPI: Introduce helper function acpi_dev_filter_resource

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Date:	Fri, 16 Jan 2015 08:58:51 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [RFC Patch 16/19] ACPI: Introduce helper function acpi_dev_filter_resource_type()

On 2015/1/16 5:30, Thomas Gleixner wrote:
> On Thu, 8 Jan 2015, Jiang Liu wrote:
> 
>> Introduce helper function acpi_dev_filter_resource_type(), which may
>> be used by acpi_dev_get_resources() to filer out resource based on
>> resource type.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>> ---
>>  drivers/acpi/resource.c |   54 +++++++++++++++++++++++++++++++++++++++++++++++
>>  include/linux/acpi.h    |    1 +
>>  2 files changed, 55 insertions(+)
>>
>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>> index 54204ac94f8e..8ea7c26d6915 100644
>> --- a/drivers/acpi/resource.c
>> +++ b/drivers/acpi/resource.c
>> @@ -570,3 +570,57 @@ int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
>>  	return c.count;
>>  }
>>  EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
>> +
>> +/**
>> + * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
>> + *				   types
>> + * @ares: Input ACPI resource object.
>> + * @arg: Valid resource types of IORESOURCE_XXX
>> + *
>> + * This is a hepler function to support acpi_dev_get_resources(), which filters
>> + * ACPI resource objects according to resource types.
>> + */
>> +int acpi_dev_filter_resource_type(struct acpi_resource *ares, void *arg)
> 
> Why is the filter a void pointer instead of an simple unsigned long?
> That does not make any sense as you convert it to unsigned long right away:
> 
>> +{
>> +	unsigned long type = 0, types = (unsigned long)arg;
> 
> So this should be:
> 
> int acpi_dev_filter_resource_type(struct acpi_resource *ares, unsigned long type_mask)
> 
> or something like that.
Hi Thomas,
	I used void * instead of unsigned long for type_mask so
acpi_dev_filter_resource_type() could directly used by
acpi_dev_get_resources(). Otherwise we need to use something like
acpi_dev_get_resources(..., (void *)acpi_dev_filter_resource_type, ...).
I will find a way to solve this:)
Regards!
Gerry

> 
> Thanks,
> 
> 	tglx
> 
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