linux-kernel - Re: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC

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Date:   Fri, 5 Jan 2018 01:07:02 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Borislav Petkov <bp@...en8.de>
cc:     Andrea Arcangeli <aarcange@...hat.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable
 SPEC_CTRL feature

On Fri, 5 Jan 2018, Borislav Petkov wrote:

> On Fri, Jan 05, 2018 at 12:51:34AM +0100, Andrea Arcangeli wrote:
> > In older kernels there's not even the boilerplate to check the static
> > key in asm,
> 
> This is the reason why I didn't use a static_key too.

We are talking about upstream first and given the amount of crap you
backported already the few lines for the ASM jump labels really do not make
a difference anymore.

I so hope this exercise will finally stop the kernel-necrophilia in
distros. I know it won't but hope dies last.

Thanks,

	tglx