linux-kernel - Re: 4.14.9 with CONFIG

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Date:   Fri, 29 Dec 2017 23:22:16 +0300
From:   Alexander Tsoy <alexander@...y.me>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     Greg KH <greg@...ah.com>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Borislav Petkov <bpetkov@...e.de>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        Will Deacon <will.deacon@....com>,
        "Liguori, Anthony" <aliguori@...zon.com>,
        Daniel Gruss <daniel.gruss@...k.tugraz.at>,
        Hugh Dickins <hughd@...gle.com>,
        Kees Cook <keescook@...gle.com>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: 4.14.9 with CONFIG_MCORE2 fails to boot

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@...el.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.