netdev - Re: [PATCH v3 00/27] kill devm_ioremap

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Message-ID: <f7632cf5-2bcc-4d74-b912-3999937a1269@roeck-us.net>
Date:   Sat, 23 Dec 2017 07:57:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Yisheng Xie <xieyisheng1@...wei.com>
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Subject: Re: [PATCH v3 00/27] kill devm_ioremap_nocache

On 12/23/2017 05:48 AM, Greg KH wrote:
> On Sat, Dec 23, 2017 at 06:55:25PM +0800, Yisheng Xie wrote:
>> Hi all,
>>
>> When I tried to use devm_ioremap function and review related code, I found
>> devm_ioremap and devm_ioremap_nocache is almost the same with each other,
>> except one use ioremap while the other use ioremap_nocache.
> 
> For all arches?  Really?  Look at MIPS, and x86, they have different
> functions.
> 

Both mips and x86 end up mapping the same function, but other arches don't.
mn10300 is one where ioremap and ioremap_nocache are definitely different.

Guenter

>> While ioremap's
>> default function is ioremap_nocache, so devm_ioremap_nocache also have the
>> same function with devm_ioremap, which can just be killed to reduce the size
>> of devres.o(from 20304 bytes to 18992 bytes in my compile environment).
>>
>> I have posted two versions, which use macro instead of function for
>> devm_ioremap_nocache[1] or devm_ioremap[2]. And Greg suggest me to kill
>> devm_ioremap_nocache for no need to keep a macro around for the duplicate
>> thing. So here comes v3 and please help to review.
> 
> I don't think this can be done, what am I missing?  These functions are
> not identical, sorry for missing that before.
> 
> thanks,
> 
> greg k-h
>