linux-kernel - Re: [patch 17/17] x86/fpu: Move FPU initialization into arch_cpu_finalize

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Date:   Tue, 13 Jun 2023 22:03:29 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     <x86@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>,
        "Nikolay Borisov" <nik.borisov@...e.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-ia64@...r.kernel.org>,
        "Huacai Chen" <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, <loongarch@...ts.linux.dev>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        <linux-m68k@...ts.linux-m68k.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        <linux-mips@...r.kernel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "John Paul Adrian Glaubitz" <glaubitz@...sik.fu-berlin.de>,
        <linux-sh@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        <sparclinux@...r.kernel.org>,
        "Richard Weinberger" <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        <linux-um@...ts.infradead.org>,
        Richard Henderson <richard.henderson@...aro.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chris Zankel <chris@...kel.net>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [patch 17/17] x86/fpu: Move FPU initialization into
 arch_cpu_finalize_init()

On 6/13/2023 4:39 PM, Thomas Gleixner wrote:
>   
> @@ -2396,6 +2393,13 @@ void __init arch_cpu_finalize_init(void)
>   			'0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
>   	}
>   
> +	/*
> +	 * Must be before alternatives because it might set or clear
> +	 * feature bits.
> +	 */
> +	fpu__init_system();
> +	fpu__init_cpu();

fpu__init_cpu() appears to be duplicated here because fpu__init_system() 
invoked this already:

void __init fpu__init_system(void)
{
...
	/*
	 * The FPU has to be operational for some of the
	 * later FPU init activities:
	 */
	fpu__init_cpu();
...
}

https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/tree/arch/x86/kernel/fpu/init.c?h=init#n223

Thanks,
Chang