Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Thu, 28 Jan 2021 10:34:45 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Chris Clayton <chris2553@googlemail.com>
Cc:     LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org
Subject: Re: linux-5.10.11 build failure
Message-ID: <YBKFNUp5WYtdg9pE@kroah.com>
References: <f141f12d-a5b9-1e60-2740-388bf350b631@googlemail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <f141f12d-a5b9-1e60-2740-388bf350b631@googlemail.com>
Precedence: bulk

On Thu, Jan 28, 2021 at 09:17:10AM +0000, Chris Clayton wrote:
> Hi,
> 
> Building 5.10.11 fails on my (x86-64) laptop thusly:
> 
> ..
> 
>  AS      arch/x86/entry/thunk_64.o
>   CC      arch/x86/entry/vsyscall/vsyscall_64.o
>   AS      arch/x86/realmode/rm/header.o
>   CC      arch/x86/mm/pat/set_memory.o
>   CC      arch/x86/events/amd/core.o
>   CC      arch/x86/kernel/fpu/init.o
>   CC      arch/x86/entry/vdso/vma.o
>   CC      kernel/sched/core.o
> arch/x86/entry/thunk_64.o: warning: objtool: missing symbol for insn at offset 0x3e
> 
>   AS      arch/x86/realmode/rm/trampoline_64.o
> make[2]: *** [scripts/Makefile.build:360: arch/x86/entry/thunk_64.o] Error 255
> make[2]: *** Deleting file 'arch/x86/entry/thunk_64.o'
> make[2]: *** Waiting for unfinished jobs....
> 
> ..
> 
> Compiler is latest snapshot of gcc-10.
> 
> Happy to test the fix but please cc me as I'm not subscribed

Can you do 'git bisect' to track down the offending commit?

And what exact gcc version are you using?

thanks,

greg k-h