[lkml]   [2017]   [Dec]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH v3 00/27] kill devm_ioremap_nocache

Le 23/12/2017 à 16:57, Guenter Roeck a écrit :
> 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.

alpha: identical
arc: identical
arm: identical
arm64: identical
cris: different <==
frv: identical
hexagone: identical
ia64: different <==
m32r: identical
m68k: identical
metag: identical
microblaze: identical
mips: identical
mn10300: different <==
nios: identical
openrisc: different <==
parisc: identical
riscv: identical
s390: identical
sh: identical
sparc: identical
tile: identical
um: rely on asm/generic
unicore32: identical
x86: identical
asm/generic (no mmu): identical

So 4 among all arches seems to have ioremap() and ioremap_nocache()
being different.

Could we have a define set by the 4 arches on which ioremap() and
ioremap_nocache() are different, something like


> 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
> --
> To unsubscribe from this list: send the line "unsubscribe
> linux-watchdog" in
> the body of a message to
> More majordomo info at

L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.

 \ /
  Last update: 2017-12-24 09:56    [W:0.101 / U:6.720 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site