linux-kernel - Re: [PATCH v2 3/3] RISC-V: hwprobe: not treat KEY_CPUPERF

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Date: Wed, 29 May 2024 11:33:42 -0700
From: Evan Green <evan@...osinc.com>
To: Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org, Elliott Hughes <enh@...gle.com>, 
	Charlie Jenkins <charlie@...osinc.com>, Jonathan Corbet <corbet@....net>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Clément Léger <cleger@...osinc.com>, 
	Conor Dooley <conor.dooley@...rochip.com>, Andrew Jones <ajones@...tanamicro.com>, 
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 3/3] RISC-V: hwprobe: not treat KEY_CPUPERF_0 as bitmask

On Thu, May 23, 2024 at 8:36 PM Yangyu Chen <cyy@...self.name> wrote:
>
> Since the value in KEY_CPUPERF_0 is not bitmask, remove the wrong code
> in hwprobe.h.
>
> Signed-off-by: Yangyu Chen <cyy@...self.name>

I'd expect a Fixes tag, and ideally some discussion on the reasoning
and ramifications of this change.

I posted the other possible fix, declaring a new key, at [1], mostly
so we could see the two options and discuss. I'm okay with either
patch.
-Evan

[1] https://lore.kernel.org/lkml/20240529182649.2635123-1-evan@rivosinc.com/T/#u

> ---
>  arch/riscv/include/asm/hwprobe.h | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/riscv/include/asm/hwprobe.h b/arch/riscv/include/asm/hwprobe.h
> index 630507dff5ea..f24cad22bbe1 100644
> --- a/arch/riscv/include/asm/hwprobe.h
> +++ b/arch/riscv/include/asm/hwprobe.h
> @@ -20,7 +20,6 @@ static inline bool hwprobe_key_is_bitmask(__s64 key)
>         switch (key) {
>         case RISCV_HWPROBE_KEY_BASE_BEHAVIOR:
>         case RISCV_HWPROBE_KEY_IMA_EXT_0:
> -       case RISCV_HWPROBE_KEY_CPUPERF_0:
>                 return true;
>         }
>
> --
> 2.45.1
>