linux-kernel - RE: [PATCH] x86: fix early boot crash on gcc-10

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Date:   Tue, 17 Mar 2020 16:35:42 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Borislav Petkov' <bp@...en8.de>, Jakub Jelinek <jakub@...hat.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Sergei Trofimovich <slyfox@...too.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>, Michael Matz <matz@...e.de>
Subject: RE: [PATCH] x86: fix early boot crash on gcc-10

From: Borislav Petkov
> Sent: 17 March 2020 14:50
> On Tue, Mar 17, 2020 at 03:39:14PM +0100, Jakub Jelinek wrote:
> > That is because the option is called -fno-stack-protector, so one needs to
> > use __attribute__((optimize("no-stack-protector")))
> 
> Ha, that works even! :-)
> 
> And my guest boots.
> 
> I guess we can do that then. Looks like the optimal solution to me.
> 
> Also, I'm assuming older gccs will simply ignore unknown optimize
> options?


Unlikely since it rejected the misspelt one.

	David

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