linux-kernel - Re: [patch 2/2] x86/mm/pti: Do not invoke PTI functions when PTI is disabled

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Message-ID: <20190830102520.GH17192@suse.de>
Date:   Fri, 30 Aug 2019 12:25:20 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Song Liu <songliubraving@...com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...riel.com>
Subject: Re: [patch 2/2] x86/mm/pti: Do not invoke PTI functions when PTI is
 disabled

On Wed, Aug 28, 2019 at 04:24:47PM +0200, Thomas Gleixner wrote:
> --- a/arch/x86/mm/pti.c
> +++ b/arch/x86/mm/pti.c
> @@ -668,6 +668,8 @@ void __init pti_init(void)
>   */
>  void pti_finalize(void)
>  {
> +	if (!boot_cpu_has(X86_FEATURE_PTI))
> +		return;
>  	/*
>  	 * We need to clone everything (again) that maps parts of the
>  	 * kernel image.
>

Reviewed-by: Joerg Roedel <jroedel@...e.de>