linux-kernel - Re: [PATCH v2] MIPS: undefine and redefine cpu_has

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Message-ID: <20220429095104.GA11365@alpha.franken.de>
Date:   Fri, 29 Apr 2022 11:51:04 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Stephen Zhang <starzhangzsd@...il.com>
Cc:     liam.howlett@...cle.com, ebiederm@...ssion.com, dbueso@...e.de,
        alobakin@...me, f.fainelli@...il.com, paul@...pouillou.net,
        linux@...ck-us.net, anemo@....ocn.ne.jp, zhangshida@...inos.cn,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        "Maciej W . Rozycki" <macro@...am.me.uk>
Subject: Re: [PATCH v2] MIPS: undefine and redefine cpu_has_fpu when it is
 overrided

On Fri, Apr 29, 2022 at 11:26:21AM +0800, Stephen Zhang wrote:
> From: Shida Zhang <zhangshida@...inos.cn>
> 
> Undefine and redefine cpu_has_fpu to 0 when it is overridden with
> the "nofpu" option.
> 
> Suggested-by: Maciej W. Rozycki <macro@...am.me.uk>
> Signed-off-by: Shida Zhang <zhangshida@...inos.cn>
> ---
>  Changelog in v1 -> v2:
>  - Choose to redefine cpu_has_fpu to solve the problem.
> 
>  arch/mips/include/asm/cpu-features.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
> index de8cb2ccb781..38eb469008b6 100644
> --- a/arch/mips/include/asm/cpu-features.h
> +++ b/arch/mips/include/asm/cpu-features.h
> @@ -134,6 +134,10 @@
>  # endif
>  #else
>  # define raw_cpu_has_fpu	cpu_has_fpu
> +# ifndef CONFIG_MIPS_FP_SUPPORT
> +#  undef cpu_has_fpu
> +#  define cpu_has_fpu		0
> +# endif
>  #endif
>  #ifndef cpu_has_32fpr
>  #define cpu_has_32fpr		__isa_ge_or_opt(1, MIPS_CPU_32FPR)
> -- 
> 2.30.2

I prefer just removing the #defines from ip27/ip30 cpu-feasture-overrides.h. 
Or isn't that enough for fixing the problem ?

Thomas.

-- 
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