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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 9 Jul 2019 17:59:39 -0700
Message-ID: <CAHk-=wj5E=WTz3jfNFnupCPoLXDyFZdW1xgKvuuU-M1_7MEqaw@mail.gmail.com>
Subject: Re: [GIT PULL] x86/topology changes for v5.3
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Ingo Molnar <mingo@kernel.org>, Kees Cook <keescook@chromium.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Borislav Petkov <bp@alien8.de>, Len Brown <lenb@kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Tony Luck <tony.luck@intel.com>, Jiri Kosina <jkosina@suse.cz>,
        Bob Moore <robert.moore@intel.com>,
        Erik Schmauss <erik.schmauss@intel.com>
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On Tue, Jul 9, 2019 at 4:00 PM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> That still does not explain the cr4/0 issue you have. Can you send me your
> .config please?

Gaah. Now I'm off my desktop and won't be at it again until tomorrow.
And that's the one that bisected to the cr0/cr4 bits (and I did all my
bisection on that because it's so much faster).

Anyway, the kernel config itself is pretty simple. It's basically a
F30 kernel config that has been through "make localmodconfig" and then
pared down some more to remove stuff I don't use (paravirt etc). I
would expect that if it's a confiuration difference, it's more likely
to be about the user mode side - since the hang does seem to happen in
user mode, not in the kernel (but a very early problem at cpu bringup
time could easily have been hidden).

On my laptop (which I am at right now), the hang is different, and
maybe it's similar to your ACPI hang issue. I will try that revert,
and at least see if that solves the laptop side.

                    Linus