linux-kernel - Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f

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Date:   Thu, 8 Feb 2018 19:03:57 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        kbuild test robot <fengguang.wu@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [linus:master] BUILD REGRESSION
 a2e5790d841658485d642196dbb0927303d6c22f

On Thu, Feb 08, 2018 at 09:27:56AM -0800, Linus Torvalds wrote:
> On Thu, Feb 8, 2018 at 1:13 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > _The_ problem is that new binutils cannot sanely decode any function
> > that has a WARN in (this very much includes perf annotate):
> 
> Ugh.
> 
> Is there any reason why we don't just use UD2 and avoid this whole issue?

That's what I initially had, but then Arjan told me that a number of
emulators fatally terminate on UD2 since they assume it to be BUG. Which
is when we all went looking at UD1/UD0.

But yes, for our purposes UD2 is perfectly fine too, it will just mess
up the people doing bringup and the like.