netdev - Re: [PATCH v3 27/27] devres: kill devm_ioremap

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Message-ID: <4d0991ec-9cd4-0c33-5560-ae9c2c762765@huawei.com>
Date:   Mon, 25 Dec 2017 09:43:40 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
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Subject: Re: [PATCH v3 27/27] devres: kill devm_ioremap_nocache



On 2017/12/23 21:45, Greg KH wrote:
> On Sat, Dec 23, 2017 at 07:02:59PM +0800, Yisheng Xie wrote:
>> --- a/lib/devres.c
>> +++ b/lib/devres.c
>> @@ -44,35 +44,6 @@ void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
>>  EXPORT_SYMBOL(devm_ioremap);
>>  
>>  /**
>> - * devm_ioremap_nocache - Managed ioremap_nocache()
>> - * @dev: Generic device to remap IO address for
>> - * @offset: Resource address to map
>> - * @size: Size of map
>> - *
>> - * Managed ioremap_nocache().  Map is automatically unmapped on driver
>> - * detach.
>> - */
>> -void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
>> -				   resource_size_t size)
>> -{
>> -	void __iomem **ptr, *addr;
>> -
>> -	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
>> -	if (!ptr)
>> -		return NULL;
>> -
>> -	addr = ioremap_nocache(offset, size);
> 
> Wait, devm_ioremap() calls ioremap(), not ioremap_nocache(), are you
> _SURE_ that these are all identical?  For all arches?  If so, then
> ioremap_nocache() can also be removed, right?

Yeah, As Christophe pointed out, that 4 archs do not have the same function.
But I do not why they do not want do the same thing. Driver may no know about
this? right?

> 
> In my quick glance, I don't think you can do this series at all :(

Yes, maybe should take Christophe suggestion and use a bool or enum to distinguish them?

Thanks
Yisheng
> 
> greg k-h
> 
> .
>