linux-kernel - Re: [tip:x86/asm 24/32] mm/migrate.o: warning: objtool: migrate_misplaced_transhuge

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Message-ID: <20171103155027.yhypc4tydthaifss@treble>
Date:   Fri, 3 Nov 2017 10:50:27 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     Andy Lutomirski <luto@...nel.org>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, tipbuild@...or.com,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>
Subject: Re: [tip:x86/asm 24/32] mm/migrate.o: warning: objtool:
 migrate_misplaced_transhuge_page()+0x71: unreachable instruction

On Fri, Nov 03, 2017 at 11:36:50AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/asm
> head:   1e4c4f610f774df6088d7c065b2dd4d22adba698
> commit: da51da189a24bb9b7e2d5a123be096e51a4695a5 [24/32] x86/entry/64: Pass SP0 directly to load_sp0()
> config: x86_64-randconfig-in0-11031034 (attached as .config)
> compiler: gcc-4.6 (Debian 4.6.4-7) 4.6.4
> reproduce:
>         git checkout da51da189a24bb9b7e2d5a123be096e51a4695a5
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All warnings (new ones prefixed by >>):
> 
> >> mm/migrate.o: warning: objtool: migrate_misplaced_transhuge_page()+0x71: unreachable instruction

I've got a fix for this one coming shortly.

-- 
Josh