linux-kernel - Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app protection modes

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Message-ID: <nycvar.YFH.7.76.1811191929160.21108@cbobk.fhfr.pm>
Date:   Mon, 19 Nov 2018 19:31:07 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
cc:     Thomas Gleixner <tglx@...utronix.de>,
        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 11/16] x86/speculation: Add Spectre v2 app to app
 protection modes

On Mon, 19 Nov 2018, Tim Chen wrote:

> >> +DEFINE_STATIC_KEY_FALSE(spectre_v2_app_lite);
> >> +EXPORT_SYMBOL_GPL(spectre_v2_app_lite);
> > 
> > Why would this be exported? The only usage site outside of this code is in
> > tlb.c which is hardly modular.
> 
> That was my initial thought too.  Ingo suggested to export it in
> review of v2.  Wonder Ingo has some reason?
> 
> https://lore.kernel.org/patchwork/patch/991759/

But why does it have to be exported at all, irrespective whether _GPL() or 
not?

Thanks,

-- 
Jiri Kosina
SUSE Labs