linux-kernel - Re: [PATCH] x86/alternatives: Fix optimize

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Date:   Wed, 10 Jan 2018 20:55:40 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw2@...radead.org>,
        Andi Kleen <andi@...stfloor.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Jiri Kosina <jikos@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] x86/alternatives: Fix optimize_nops() checking

On Wed, 10 Jan 2018, Linus Torvalds wrote:

> On Wed, Jan 10, 2018 at 3:28 AM, Borislav Petkov <bp@...en8.de> wrote:
> >
> > Make sure we scan all bytes before we decide to optimize the NOPs in
> > there.
> 
> Can we also add compile-time checking (presumably in objtool, but who
> knows) that there are no relocations in the alternative section?

Cc'ing the overlor^Haded objtool wizard

> Because that was the other "oops, this really doesn't work with
> altinstructions" issue, wasn't it?

Yes.

Thanks,

	tglx