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

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Date:   Wed, 7 Feb 2018 11:03:42 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.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>
Subject: Re: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f

On Wed, Feb 7, 2018 at 10:49 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> Right, we picked UD0 because we _thought_ everybody agreed it being 2
> bytes, just like UD2. This is now not true anymore?

Both UD0 and UD1 are documented to have modrm in the latest Intel SDM
I can find (Order number 325462-065US, December 2017):

  https://software.intel.com/sites/default/files/managed/39/c5/325462-sdm-vol-1-2abcd-3abcd.pdf

for the direct link.

           Linus