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Subject: Re: [PATCH] x86/retpoline: Fix forcing me to update my compiler
To:     Borislav Petkov <bp@alien8.de>
Cc:     Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Zhenzhong Duan <zhenzhong.duan@oracle.com>,
        "H . Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
References: <20181208123816.22952-1-k.marinushkin@gmail.com>
 <20181208124240.GE30399@zn.tnic>
From:   Kirill Marinushkin <k.marinushkin@gmail.com>
Message-ID: <7d8aa04f-9611-fb69-b11c-21ebcf4580fd@gmail.com>
Date:   Sat, 8 Dec 2018 14:14:47 +0100
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>> First problem: I cannot compile the kernel with my version of compiler

>> Second problem: when I disable the feature - it cannot take effect,
>> because the parse-time error happens before `syncconfig`

On 12/08/18 13:42, Borislav Petkov wrote:
> Does this help?
> 
> https://git.kernel.org/tip/25896d073d8a0403b07e6dec56f58e6c33678207
> 

The patch which you mentioned fixes the second problem: now I can disable
CONFIG_RETPOLINE.
But, the first problem is still here: with defconfig and gcc v6.4.0, kernel
doesn't build, with this message:

~~~~
$ make
scripts/kconfig/conf  --syncconfig Kconfig
You are building kernel with non-retpoline compiler.
Please update your compiler.
make: *** [arch/x86/Makefile:311: checkbin] Error 1
~~~~

I don't think that this is a proper behavior. I suggest to allow compilation

Best Regards,
Kirill