linux-kernel - Re: [PATCH v3 08/11] x86/mm: Disable PCID on 32-bit kernels

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Message-ID: <20170623092403.qytmaokmhve5b6k4@pd.tnic>
Date:   Fri, 23 Jun 2017 11:24:03 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 08/11] x86/mm: Disable PCID on 32-bit kernels

On Tue, Jun 20, 2017 at 10:22:14PM -0700, Andy Lutomirski wrote:
> 32-bit kernels on new hardware will see PCID in CPUID, but PCID can
> only be used in 64-bit mode.  Rather than making all PCID code
> conditional, just disable the feature on 32-bit builds.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  arch/x86/include/asm/disabled-features.h | 4 +++-
>  arch/x86/kernel/cpu/bugs.c               | 8 ++++++++
>  2 files changed, 11 insertions(+), 1 deletion(-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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