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

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Message-ID: <c6cbd41c-4cef-d4d7-324a-b4c3e2498262@csgroup.eu>
Date:   Wed, 18 May 2022 09:41:02 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] powerpc: Add generic PAGE_SIZE config symbols



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.


> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>   arch/powerpc/Kconfig | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 145af02df3dc..02994361cc7a 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -759,6 +759,22 @@ config PPC_256K_PAGES
>   
>   endchoice
>   
> +config PAGE_SIZE_4KB
> +	def_bool y
> +	depends on PPC_4K_PAGES
> +
> +config PAGE_SIZE_16KB
> +	def_bool y
> +	depends on PPC_16K_PAGES
> +
> +config PAGE_SIZE_64KB
> +	def_bool y
> +	depends on PPC_64K_PAGES
> +
> +config PAGE_SIZE_256KB
> +	def_bool y
> +	depends on PPC_256K_PAGES
> +
>   config PPC_PAGE_SHIFT
>   	int
>   	default 18 if PPC_256K_PAGES