linux-kernel - Re: [GIT PULL] x86/topology changes for v5.3

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Date:   Tue, 9 Jul 2019 17:59:39 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...en8.de>, Len Brown <lenb@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Tony Luck <tony.luck@...el.com>, Jiri Kosina <jkosina@...e.cz>,
        Bob Moore <robert.moore@...el.com>,
        Erik Schmauss <erik.schmauss@...el.com>
Subject: Re: [GIT PULL] x86/topology changes for v5.3

On Tue, Jul 9, 2019 at 4:00 PM Thomas Gleixner <tglx@...utronix.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