linux-kernel - Re: [Patch v5 08/16] smt: Create cpu_smt_enabled static key for SMT specific code

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Message-ID: <b62e6ce2-3a82-f8f0-ab6d-51ab235859a0@linux.intel.com>
Date:   Mon, 19 Nov 2018 12:50:48 -0800
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
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>,
        Waiman Long <longman9394@...il.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [Patch v5 08/16] smt: Create cpu_smt_enabled static key for SMT
 specific code

On 11/19/2018 04:58 AM, Thomas Gleixner wrote:

>> +DECLARE_STATIC_KEY_TRUE(cpu_smt_enabled);
> 
> And here it is declared unconditionally which allows code to use it despite
> CONFIG_HOTPLUG_SMT=n and subsequently breaks the build.

Will put this under #ifdef CONFIG_HOTPLUG_SMT

Tim