linux-kernel - Re: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.15 146/150] kernel/futex.o: warning: objtool: futex_atomic_op

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Date:   Thu, 12 May 2022 10:11:55 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        Borislav Petkov <bp@...e.de>
Subject: Re: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.15 146/150]
 kernel/futex.o: warning: objtool: futex_atomic_op_inuser()+0xb8: unreachable
 instruction

On Thu, May 12, 2022 at 10:17:09AM +0200, Peter Zijlstra wrote:
> On Thu, May 12, 2022 at 10:00:33AM +0800, kernel test robot wrote:
> > tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/5.15
> > head:   305e905f70311e1b49cc730931a19c3e364f4d8c
> > commit: 45dc9d706619a6814e4063d5431483f94badb5a1 [146/150] x86: Add straight-line-speculation mitigation
> > config: x86_64-randconfig-m001-20220509 (https://download.01.org/0day-ci/archive/20220512/202205120956.qLpGQurX-lkp@intel.com/config)
> > compiler: gcc-11 (Debian 11.2.0-20) 11.2.0
> > reproduce (this is a W=1 build):
> >         # https://github.com/ammarfaizi2/linux-block/commit/45dc9d706619a6814e4063d5431483f94badb5a1
> >         git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
> >         git fetch --no-tags ammarfaizi2-block stable/linux-stable-rc/queue/5.15
> >         git checkout 45dc9d706619a6814e4063d5431483f94badb5a1
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All warnings (new ones prefixed by >>):
> > 
> > >> kernel/futex.o: warning: objtool: futex_atomic_op_inuser()+0xb8: unreachable instruction
> > --
> > >> mm/madvise.o: warning: objtool: madvise_behavior()+0x69: unreachable instruction
> > --
> > >> kernel/bpf/btf.o: warning: objtool: __btf_resolve_size()+0x72: unreachable instruction
> 
> Would it be possible for the robot to include the output of this script:
> 
>   https://lkml.kernel.org/r/3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@redhat.com

Ha, I already forgot about that script.  I'll drop it into my
objtool/core branch (eventually for tip) unless anybody objects.

-- 
Josh