linux-kernel - Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select Spectre v2 mitigation

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Date:   Wed, 24 Jan 2018 05:26:31 +0100
From:   Greg Kroah-Hartman <gregkh@...ux-foundation.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Andi Kleen <ak@...ux.intel.com>, Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        gnomes@...rguk.ukuu.org.uk, x86@...nel.org,
        thomas.lendacky@....com, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH v8 04/12] x86/spectre: Add boot time option to select
 Spectre v2 mitigation

On Wed, Jan 24, 2018 at 12:49:37AM +0100, Jiri Kosina wrote:
> On Tue, 23 Jan 2018, Andi Kleen wrote:
> 
> > > Thanks for pointing this out, Andi. I've been just now writing more or 
> > > less the same thing; ditching that and will reuse your patch instead.
> > > 
> > > Why was the more aggresive version (6cfb521ac0d5b) merged into Linus' tree 
> > > instead of that?
> > 
> > Greg prefered using modversions
> 
> Ah. OK, Greg: I'll eat my hat (I've heard that's very popular these times) 
> if there is a major enterprise distro that doesn't revert this patch 
> immediately.

But will Andi's patch work well for you?  Adding a MODULE_INFO() tag to
every module?  I just thought since you were already using modversions
in enterprise distros already, that adding it there would be the
simplest.

If I am wrong, great, let's revert this and add something that you
really will use, otherwise it's just pointless code :)

Perhaps adding a MODULE_INFO() tag for the entire gcc and ld flags would
be nice in the end, as others have pointed out in this thread, but I
don't know if that solves your issue here or not.

thanks,

greg k-h