Re: [kbuild-all] Re: [tip:locking/core 4/5] vmlinux.o: warning: objtool: do_machine_check()+0x419: call to mca_msr_reg() leaves .noinstr.text section

[Chen, Rong A]

On 3/14/2022 8:01 PM, Borislav Petkov wrote:
> On Mon, Mar 14, 2022 at 07:40:08PM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core
> > head:   cd27ccfc727e99352321c0c75012ab9c5a90321e
> > commit: acb13ea0baf8db8d05a3910c06e997c90825faad [4/5] asm-generic/bitops: Always inline all bit manipulation helpers
> > config: x86_64-randconfig-a005-20220314 (https://download.01.org/0day-ci/archive/20220314/202203141947.9KhIyyR7-lkp@xxxxxxxxx/config)
> > compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
> > reproduce (this is a W=1 build):
> >          # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=acb13ea0baf8db8d05a3910c06e997c90825faad
> >          git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> >          git fetch --no-tags tip locking/core
> >          git checkout acb13ea0baf8db8d05a3910c06e997c90825faad
> >          # save the config file 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: mce_read_aux()+0x42: call to mca_msr_reg() leaves .noinstr.text section
> > > > vmlinux.o: warning: objtool: do_machine_check()+0x419: call to mca_msr_reg() leaves .noinstr.text section
> >     vmlinux.o: warning: objtool: enter_from_user_mode()+0x4a: call to on_thread_stack() leaves .noinstr.text section
> >     vmlinux.o: warning: objtool: syscall_enter_from_user_mode()+0x53: call to on_thread_stack() leaves .noinstr.text section
> >     vmlinux.o: warning: objtool: syscall_enter_from_user_mode_prepare()+0x4a: call to on_thread_stack() leaves .noinstr.text section
> >     vmlinux.o: warning: objtool: irqentry_enter_from_user_mode()+0x4a: call to on_thread_stack() leaves .noinstr.text section
>
> You need to test tip/ras/core with that .config - not some random
> patches inside of locking/core. Fixing the noinstr issues is split into
> a couple of patches in locking/core and ras/core.
>
> Thx.

Hi Borislav,

Thanks for the explanation, should we skip testing the locking/core 
branch next time?

Best Regards,
Rong Chen