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

["Chen, Rong A" <rong.a.chen@intel.com>]

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@intel.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. ;-\
> 

Hi Borislav,

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

Best Regards,
Rong Chen