linux-kernel - Re: 4.14.9 doesn't boot (regression)

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Message-ID: <CA+55aFz+moL9zem-gGnRtGSzYV0yL+GoA=3+XrUZy9t=cmhBhw@mail.gmail.com>
Date:   Fri, 29 Dec 2017 12:12:38 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Toralf Förster <toralf.foerster@....de>,
        Andy Lutomirski <luto@...capital.net>
Cc:     stable <stable@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: 4.14.9 doesn't boot (regression)

On Fri, Dec 29, 2017 at 3:14 AM, Toralf Förster <toralf.foerster@....de> wrote:
>
> For the server the attached .config works fine but switching from
> CONFIG_GENERIC_CPU to CONFIG_MCORE2 legt them hang at boot w/op any
> messages. Similar picture at the desktop.

Ok, so there's another thread ("4.14.9 with CONFIG_MCORE2 fails to
boot") about this same thing, but one thing to try is to see if it's
just the

         cflags-$(CONFIG_MCORE2) += \
                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))

in arch/x86/Makefile that causes this.

The MCORE2 option does potentially have a few other effects (see
arch/x86/Kconfig.cpu), but the first one to check might be just that
compiler command line effect.

So if you can edit arch/x86/Makefile, and just make that say

        cflags-$(CONFIG_MCORE2) += $(call cc-option,-mtune=generic)

instead, and see if that makes a difference, that would narrow down
the possible root cause of this problem.

                Linus