Re: 4.14.9 doesn't boot (regression)

[Linus Torvalds]

On Fri, Dec 29, 2017 at 3:14 AM, Toralf FÃrster <toralf.foerster@xxxxxx> 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