linux-kernel - Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

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Message-ID: <20220119102250.7e20b3df@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Wed, 19 Jan 2022 10:22:50 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Borislav Petkov <bp@...e.de>
Cc:     kernel test robot <lkp@...el.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to
 memset() leaves .noinstr.text section

On Tue, 26 Oct 2021 10:23:30 +0200 Borislav Petkov wrote:
> On Tue, Oct 26, 2021 at 04:16:21PM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   3906fe9bb7f1a2c8667ae54e967dc8690824f4ea
> > commit: 7bb39313cd6239e7eb95198950a02b4ad2a08316 x86/mce: Make mce_timed_out() identify holdout CPUs
> > date:   10 months ago
> > config: x86_64-buildonly-randconfig-r006-20211022 (attached as .config)
> > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> > reproduce (this is a W=1 build):
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bb39313cd6239e7eb95198950a02b4ad2a08316
> >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 7bb39313cd6239e7eb95198950a02b4ad2a08316
> >         # save the attached .config to linux build tree
> >         mkdir build_dir
> >         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 >>):
> 
> if you have the technical capability to ignore all noinstr warnings
> coming from the mce code, please do so.
> 
> I have a patchset to address that but more important work preempts me
> constantly from cleaning it up and sending it out properly. ;-\

Any progress? Anything I can help with?

I was hoping that 5.17 would fix this but I just merged Linus's tree
with netdev today and the warnings are still there :(