[PATCH v3 00/27] kill devm_ioremap_nocache

Guenter Roeck linux at roeck-us.net
Sat Dec 23 15:57:40 UTC 2017

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.


>> 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

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