Re: [kbuild-all] Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

[Chen, Rong A]

On 10/26/2021 4:23 PM, Borislav Petkov wrote:
> 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@xxxxxxxxx>
> >
> > 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. ;-\

Hi Borislav,

Thanks for the feedback, We have ignored these warnings from mce.

Best Regards,
Rong Chen