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

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Message-ID: <20200316182206.GA354531@rani.riverdale.lan>
Date:   Mon, 16 Mar 2020 14:22:08 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Sergei Trofimovich <slyfox@...too.org>
Cc:     linux-kernel@...r.kernel.org, Jakub Jelinek <jakub@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Subject: Re: [PATCH] x86: fix early boot crash on gcc-10

On Sat, Mar 14, 2020 at 04:44:51PM +0000, Sergei Trofimovich wrote:
>  arch/x86/kernel/Makefile | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
> index 9b294c13809a..da9f4ea9bf4c 100644
> --- a/arch/x86/kernel/Makefile
> +++ b/arch/x86/kernel/Makefile
> @@ -11,6 +11,12 @@ extra-y	+= vmlinux.lds
>  
>  CPPFLAGS_vmlinux.lds += -U$(UTS_MACHINE)
>  
> +# smpboot's init_secondary initializes stack canary.
	       ^^^^ should be start_secondary?
> +# Make sure we don't emit stack checks before it's
> +# initialized.
> +nostackp := $(call cc-option, -fno-stack-protector)
> +CFLAGS_smpboot.o := $(nostackp)
> +
>  ifdef CONFIG_FUNCTION_TRACER
>  # Do not profile debug and lowlevel utilities
>  CFLAGS_REMOVE_tsc.o = -pg
> -- 
> 2.25.1
>