linux-kernel - Re: [PATCH] arch/mips/kernel/traps: add CONFIG_MIPS_FP_SUPPORT when using handle

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Date:   Fri, 29 Apr 2022 11:10:25 +0800
From:   Stephen Zhang <starzhangzsd@...il.com>
To:     "Maciej W. Rozycki" <macro@...am.me.uk>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Joshua Kinard <kumba@...too.org>, liam.howlett@...cle.com,
        ebiederm@...ssion.com, dbueso@...e.de, alobakin@...me,
        f.fainelli@...il.com, zhangshida <zhangshida@...inos.cn>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH] arch/mips/kernel/traps: add CONFIG_MIPS_FP_SUPPORT when
 using handle_fpe

Maciej W. Rozycki <macro@...am.me.uk> 于2022年4月28日周四 17:00写道：
>
> On Thu, 28 Apr 2022, Stephen Zhang wrote:
>  Thanks.
>
>  The bug is in arch/mips/include/asm/mach-ip27/cpu-feature-overrides.h,
> which has:
>
> #define cpu_has_fpu                     1
>
> (and similarly arch/mips/include/asm/mach-ip30/cpu-feature-overrides.h).
> This is not supported, as noted in arch/mips/include/asm/cpu-features.h:
>
> /* Don't override `cpu_has_fpu' to 1 or the "nofpu" option won't work.  */
>
> Perhaps we should explicitly undefine `cpu_has_fpu' if set to 1?
>
>   Maciej

Thanks for your detailed explanation and suggestion. I will make a v2 patch.