linux-kernel - Re: [PATCH 1/2] powerpc: Add generic PAGE

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Message-ID: <bb753aaf-2f55-f213-f714-e8b7bca21f56@csgroup.eu>
Date:   Wed, 18 May 2022 13:27:57 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] powerpc: Add generic PAGE_SIZE config symbols



Le 18/05/2022 à 15:21, Arnd Bergmann a écrit :
> On Wed, May 18, 2022 at 2:00 PM Michael Ellerman <mpe@...erman.id.au> wrote:
>>
>> Christophe Leroy <christophe.leroy@...roup.eu> writes:
>>> Le 05/05/2022 à 14:51, Michael Ellerman a écrit :
>>>> Other arches (sh, mips, hexagon) use standard names for PAGE_SIZE
>>>> related config symbols.
>>>>
>>>> Add matching symbols for powerpc, which are enabled by default but
>>>> depend on our architecture specific PAGE_SIZE symbols.
>>>>
>>>> This allows generic/driver code to express dependencies on the PAGE_SIZE
>>>> without needing to refer to architecture specific config symbols.
>>>
>>> I guess next step should be to get rid of powerpc specific symbols and
>>> use generic symbols instead.
>>>
>>> We have (only) 111 occurences of it.
>>
>> I thought about doing that, but it's quite a bit of churn. Maybe it's
>> worth it though to avoid confusion between the two symbols.
> 
> I have actually done this at some point, but for some reason never sent it out,
> see my old patch at:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commit/?h=randconfig-5.15-next&id=184c7273ee367fda3626e35f0079f181075690c8
> 
> Feel free to take ideas or the entire patch from that.
> 


Well, at this point I was just talking about renaming the 
CONFIG_PPC_xxK_PAGES symbols to the generic naming while still keeping 
them in powerpc Kconfig.

You are going one step further by making it a generic arch symbol, 
that's also a good idea and can be done more or less independantly.

Christophe