linux-kernel - Re: linux-parisc compile failure in current git

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Date:   Fri, 19 Aug 2022 18:22:51 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Helge Deller <deller@....de>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Parisc List <linux-parisc@...r.kernel.org>,
        Meelis Roos <mroos@...ux.ee>,
        Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: linux-parisc compile failure in current git

Hi,

On 8/19/22 10:58, Helge Deller wrote:
> * Masahiro Yamada <masahiroy@...nel.org>:
>>
>> Then, you can mimic sparc code.

Good idea.

> The patch below fixes it nicely and I've pushed it into the parisc
> for-next git tree.
> 
> @Randy: Maybe you could try it as well. With that approach
> you get what you want. Maybe that's a better approach for riscv64 as
> well?

I like this one better than the earlier attempt.
It's more generic.


> From a529c0a388f74a243363976af8535b10d3d69d20 Mon Sep 17 00:00:00 2001
> From: Helge Deller <deller@....de>
> Date: Fri, 19 Aug 2022 19:30:50 +0200
> Subject: [PATCH] parisc: Enable CONFIG_64BIT for ARCH=parisc64 only
> 
> With this patch the ARCH= parameter decides if the
> CONFIG_64BIT option will be set or not. This means, the
> ARCH= parameter will give:
> 
> 	ARCH=parisc	-> 32-bit kernel
> 	ARCH=parisc64	-> 64-bit kernel
> 
> This simplifies the usage of the other config options like
> randconfig, allmodconfig and allyesconfig a lot and produces
> the output which is expected for parisc64 (64-bit) vs. parisc (32-bit).
> 
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Signed-off-by: Helge Deller <deller@....de>
> 
> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
> index 7f059cd1196a..9aede2447011 100644
> --- a/arch/parisc/Kconfig
> +++ b/arch/parisc/Kconfig
> @@ -146,10 +146,10 @@ menu "Processor type and features"
> 
>  choice
>  	prompt "Processor type"
> -	default PA7000
> +	default PA7000 if "$(ARCH)" = "parisc"
> 
>  config PA7000
> -	bool "PA7000/PA7100"
> +	bool "PA7000/PA7100" if "$(ARCH)" = "parisc"
>  	help
>  	  This is the processor type of your CPU.  This information is
>  	  used for optimizing purposes.  In order to compile a kernel
> @@ -160,21 +160,21 @@ config PA7000
>  	  which is required on some machines.
> 
>  config PA7100LC
> -	bool "PA7100LC"
> +	bool "PA7100LC" if "$(ARCH)" = "parisc"
>  	help
>  	  Select this option for the PCX-L processor, as used in the
>  	  712, 715/64, 715/80, 715/100, 715/100XC, 725/100, 743, 748,
>  	  D200, D210, D300, D310 and E-class
> 
>  config PA7200
> -	bool "PA7200"
> +	bool "PA7200" if "$(ARCH)" = "parisc"
>  	help
>  	  Select this option for the PCX-T' processor, as used in the
>  	  C100, C110, J100, J110, J210XC, D250, D260, D350, D360,
>  	  K100, K200, K210, K220, K400, K410 and K420
> 
>  config PA7300LC
> -	bool "PA7300LC"
> +	bool "PA7300LC" if "$(ARCH)" = "parisc"
>  	help
>  	  Select this option for the PCX-L2 processor, as used in the
>  	  744, A180, B132L, B160L, B180L, C132L, C160L, C180L,
> @@ -224,17 +224,8 @@ config MLONGCALLS
>  	  Enabling this option will probably slow down your kernel.
> 
>  config 64BIT
> -	bool "64-bit kernel"
> +	def_bool "$(ARCH)" = "parisc64"
>  	depends on PA8X00
> -	help
> -	  Enable this if you want to support 64bit kernel on PA-RISC platform.
> -
> -	  At the moment, only people willing to use more than 2GB of RAM,
> -	  or having a 64bit-only capable PA-RISC machine should say Y here.
> -
> -	  Since there is no 64bit userland on PA-RISC, there is no point to
> -	  enable this option otherwise. The 64bit kernel is significantly bigger
> -	  and slower than the 32bit one.
> 
>  choice
>  	prompt "Kernel page size"

LGTM.
Tested-by: Randy Dunlap <rdunlap@...radead.org>
Reviewed-by: Randy Dunlap <rdunlap@...radead.org>


Thanks.
-- 
~Randy