linux-kernel - Re: [PATCH 1/1] MIPS: move unselectable entries out of the "CPU type" choice

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Message-ID: <b365fa0a-845c-4698-bf37-9b8a15fd9f98@flygoat.com>
Date: Sat, 27 Jan 2024 19:50:57 +0000
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Masahiro Yamada <masahiroy@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, linux-mips@...r.kernel.org
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] MIPS: move unselectable entries out of the "CPU type"
 choice



在 2024/1/27 16:23, Masahiro Yamada 写道:
> Move the following entries out of the "CPU type" choice:
>
>   - LOONGSON3_ENHANCEMENT
>   - CPU_LOONGSON3_WORKAROUNDS
>   - CPU_LOONGSON3_CPUCFG_EMULATION
>
> These entries cannot be selected from the choice because they depend on
> CPU_LOONGSON64, which is also located in the same choice.
>
> In fact, Kconfig does not consider them as choice values because they
> become children of CPU_LOOONGSON64 due to the automatic submenu creation
> in menu_finalize().
>
> However, it is hard to understand this behavior unless you are familiar
> with the Kconfig internals.
>
> "choice" should contain only selectable entries.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>

Thanks!
> ---
>
>   arch/mips/Kconfig | 76 +++++++++++++++++++++++------------------------
>   1 file changed, 38 insertions(+), 38 deletions(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 797ae590ebdb..a70b4f959fb1 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1269,44 +1269,6 @@ config CPU_LOONGSON64
>   	  3B1000, 3B1500, 3A2000, 3A3000 and 3A4000) processors. However, old
>   	  Loongson-2E/2F is not covered here and will be removed in future.
>   
> -config LOONGSON3_ENHANCEMENT
> -	bool "New Loongson-3 CPU Enhancements"
> -	default n
> -	depends on CPU_LOONGSON64
> -	help
> -	  New Loongson-3 cores (since Loongson-3A R2, as opposed to Loongson-3A
> -	  R1, Loongson-3B R1 and Loongson-3B R2) has many enhancements, such as
> -	  FTLB, L1-VCache, EI/DI/Wait/Prefetch instruction, DSP/DSPr2 ASE, User
> -	  Local register, Read-Inhibit/Execute-Inhibit, SFB (Store Fill Buffer),
> -	  Fast TLB refill support, etc.
> -
> -	  This option enable those enhancements which are not probed at run
> -	  time. If you want a generic kernel to run on all Loongson 3 machines,
> -	  please say 'N' here. If you want a high-performance kernel to run on
> -	  new Loongson-3 machines only, please say 'Y' here.
> -
> -config CPU_LOONGSON3_WORKAROUNDS
> -	bool "Loongson-3 LLSC Workarounds"
> -	default y if SMP
> -	depends on CPU_LOONGSON64
> -	help
> -	  Loongson-3 processors have the llsc issues which require workarounds.
> -	  Without workarounds the system may hang unexpectedly.
> -
> -	  Say Y, unless you know what you are doing.
> -
> -config CPU_LOONGSON3_CPUCFG_EMULATION
> -	bool "Emulate the CPUCFG instruction on older Loongson cores"
> -	default y
> -	depends on CPU_LOONGSON64
> -	help
> -	  Loongson-3A R4 and newer have the CPUCFG instruction available for
> -	  userland to query CPU capabilities, much like CPUID on x86. This
> -	  option provides emulation of the instruction on older Loongson
> -	  cores, back to Loongson-3A1000.
> -
> -	  If unsure, please say Y.
> -
>   config CPU_LOONGSON2E
>   	bool "Loongson 2E"
>   	depends on SYS_HAS_CPU_LOONGSON2E
> @@ -1644,6 +1606,44 @@ config CPU_BMIPS
>   
>   endchoice
>   
> +config LOONGSON3_ENHANCEMENT
> +	bool "New Loongson-3 CPU Enhancements"
> +	default n
> +	depends on CPU_LOONGSON64
> +	help
> +	  New Loongson-3 cores (since Loongson-3A R2, as opposed to Loongson-3A
> +	  R1, Loongson-3B R1 and Loongson-3B R2) has many enhancements, such as
> +	  FTLB, L1-VCache, EI/DI/Wait/Prefetch instruction, DSP/DSPr2 ASE, User
> +	  Local register, Read-Inhibit/Execute-Inhibit, SFB (Store Fill Buffer),
> +	  Fast TLB refill support, etc.
> +
> +	  This option enable those enhancements which are not probed at run
> +	  time. If you want a generic kernel to run on all Loongson 3 machines,
> +	  please say 'N' here. If you want a high-performance kernel to run on
> +	  new Loongson-3 machines only, please say 'Y' here.
> +
> +config CPU_LOONGSON3_WORKAROUNDS
> +	bool "Loongson-3 LLSC Workarounds"
> +	default y if SMP
> +	depends on CPU_LOONGSON64
> +	help
> +	  Loongson-3 processors have the llsc issues which require workarounds.
> +	  Without workarounds the system may hang unexpectedly.
> +
> +	  Say Y, unless you know what you are doing.
> +
> +config CPU_LOONGSON3_CPUCFG_EMULATION
> +	bool "Emulate the CPUCFG instruction on older Loongson cores"
> +	default y
> +	depends on CPU_LOONGSON64
> +	help
> +	  Loongson-3A R4 and newer have the CPUCFG instruction available for
> +	  userland to query CPU capabilities, much like CPUID on x86. This
> +	  option provides emulation of the instruction on older Loongson
> +	  cores, back to Loongson-3A1000.
> +
> +	  If unsure, please say Y.
> +
>   config CPU_MIPS32_3_5_FEATURES
>   	bool "MIPS32 Release 3.5 Features"
>   	depends on SYS_HAS_CPU_MIPS32_R3_5

-- 
---
Jiaxun Yang