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

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Message-ID: <YXe7AnMmiWXk36NC@zn.tnic>
Date:   Tue, 26 Oct 2021 10:23:30 +0200
From:   Borislav Petkov <bp@...e.de>
To:     kernel test robot <lkp@...el.com>
Cc:     "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

Hi,

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 >>):
> 
>>> vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

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. ;-\

-- 
Regards/Gruss,
    Boris.

SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 36809, AG Nürnberg