linux-kernel - Re: [patch 02/17] x86/cpu: Switch to arch_cpu_finalize

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Message-ID: <87legm8j4h.ffs@tglx>
Date:   Wed, 14 Jun 2023 11:53:50 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     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 02/17] x86/cpu: Switch to arch_cpu_finalize_init()

On Wed, Jun 14 2023 at 01:39, Thomas Gleixner wrote:
> +	/*
> +	 * identify_boot_cpu() initialized SMT support information, let the
> +	 * core code know.
> +	 */
> +	cpu_smt_check_topology();
> +
> +	if (!IS_ENABLED(CONFIG_SMP)) {
> +		pr_info("CPU: ");
> +		print_cpu_info(&boot_cpu_data);
> +	}
> +
> +	arch_smt_update();
> +
> +	cpu_select_mitigations();

That's the wrong order. mitigations must come before the smt
update. Thanks to Boris for spotting it.