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Message-ID: <20180903143656.GD24142@hirez.programming.kicks-ass.net>
Date: Mon, 3 Sep 2018 16:36:56 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Jiri Kosina <jikos@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Andrea Arcangeli <aarcange@...hat.com>,
"Woodhouse, David" <dwmw@...zon.co.uk>,
linux-kernel@...r.kernel.org, x86@...nel.org,
Oleg Nesterov <oleg@...hat.com>,
Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [PATCH v2 3/3] x86/speculation: Enable cross-hyperthread spectre
v2 STIBP mitigation
On Mon, Sep 03, 2018 at 04:34:44PM +0200, Peter Zijlstra wrote:
> On Mon, Sep 03, 2018 at 02:45:31PM +0200, Jiri Kosina wrote:
>
> > +static bool __init stibp_needed(void)
> > +{
> > + return (cpu_smt_control != CPU_SMT_NOT_SUPPORTED &&
> > + boot_cpu_has(X86_FEATURE_STIBP));
> > +}
>
> Should that not be:
>
> ((cpu_smt_control != CPU_SMT_NOT_SUPPORTED) ||
s/||/&&/
> (cpu_smt_control != CPU_SMT_FORCE_DISABLED)) &&
> boot_cpu_has(X86_FEATURE_STIBP);
>
> instead?
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