Message-ID: <1514578936.28262.11.camel@tsoy.me>
Subject: Re: 4.14.9 with CONFIG_MCORE2 fails to boot
From: Alexander Tsoy <alexander@tsoy.me>
To: Linus Torvalds <torvalds@linux-foundation.org>,
        Dave Hansen <dave.hansen@intel.com>
Cc: Greg KH <greg@kroah.com>, Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>,
        Borislav Petkov <bp@suse.de>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Borislav Petkov <bp@alien8.de>, Borislav Petkov <bpetkov@suse.de>,
        Brian Gerst <brgerst@gmail.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Laight <David.Laight@aculab.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Eduardo Valentin <eduval@amazon.com>,
        Greg KH <gregkh@linuxfoundation.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>, Juergen Gross <jgross@suse.com>,
        Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>,
        Will Deacon <will.deacon@arm.com>,
        "Liguori, Anthony" <aliguori@amazon.com>,
        Daniel Gruss <daniel.gruss@iaik.tugraz.at>,
        Hugh Dickins <hughd@google.com>, Kees Cook <keescook@google.com>,
        Kernel Mailing List <linux-kernel@vger.kernel.org>,
        stable <stable@vger.kernel.org>
Date: Fri, 29 Dec 2017 23:22:16 +0300
In-Reply-To: <CA+55aFwgNQt_7C20XjgKt3MNnrix3wJcVou5GGNX3yRvMMtP4g@mail.gmail.com>
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В Пт, 29/12/2017 в 11:31 -0800, Linus Torvalds пишет:
> On Fri, Dec 29, 2017 at 9:32 AM, Dave Hansen <dave.hansen@intel.com> 
> 
--------------->%---------------
> > 
> > MCORE2 seems to get one oddball compiler flag (-march=core2):
> > 
> > >         cflags-$(CONFIG_MCORE2) += \
> > >                 $(call cc-option,-march=core2,$(call cc-option,-
> > > mtune=generic))
> > 
> > It would be interesting to see if replacing the above "$(call"
> > with:
> > 
> >         $(call cc-option,-mtune=generic)
> > 
> > makes the problem go away the same way as changing the .config
> > option.
> 
> Definitely.
> 
--------------->%---------------
> But double-checking that "-march=core2" case is definitely worth
> looking into. Especially since there are clear indications that it's
> gcc version-dependent anyway. Alexander?
> 

Yes, the change suggested by Dave makes the problem go away.