linux-kernel - Re: [GIT pull] x86/pti updates for 4.15

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Date:   Sun, 14 Jan 2018 22:01:44 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     David Woodhouse <dwmw@...zon.co.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [GIT pull] x86/pti updates for 4.15

On Sun, 14 Jan 2018, Linus Torvalds wrote:
> On Sun, Jan 14, 2018 at 7:27 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> >    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-pti-for-linus
> 
> So I do think this:
> 
>         $(warning CONFIG_RETPOLINE=y, but not supported by the
> compiler. Toolchain update recommended.)
> 
> needs to be removed.
> 
> Yes, yes, I understand why it's warning. It's still both annoying and wrong.
> 
> It's wrong because it will just make people turn off RETPOLINE, and
> the asm updates - and return stack clearing - that are independent of
> the compiler are likely the most important parts because they are
> likely the ones easiest to target.
> 
> And it's annoying because most people won't be able to do anything
> about it. The number of people building their own compiler? Very
> small. So if their distro hasn't got a compiler yet (and pretty much
> nobody does), the warning is just annoying crap.
> 
> It is already properly reported as part of the sysfs interface. The
> compile-time warning only encourages bad things.

Good point. I'll queue a patch to that effect or do you just want to do
that yourself?

Thanks,

	tglx