linux-kernel - Re: [Patch v3 05/13] x86/smt: Create cpu_smt_enabled static key for SMT specific code

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Date:   Thu, 18 Oct 2018 15:03:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     Jiri Kosina <jikos@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [Patch v3 05/13] x86/smt: Create cpu_smt_enabled static key for
 SMT specific code

On Wed, 17 Oct 2018, Tim Chen wrote:

> Create the cpu_smt_enabled static key to indicate if we are
> using SMT.  SMT specific code paths are executed only when SMT
> code paths are enabled by this key.
> 
> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
> ---
>  arch/x86/kernel/cpu/bugs.c |  2 +-
>  arch/x86/kvm/vmx.c         |  2 +-
>  include/linux/cpu.h        |  1 +
>  kernel/cpu.c               | 12 ++++++++++--

I have a hard time to understand why the subject prefix is x86/smt.

This want's to be split into:

1) Add the static key to the core

2) Make use of it in x86

Thanks,

	tglx