Re: [tip:locking/core 10/10] sclp_early_core.c:undefined reference to `warn_bogus_irq_restore'

[Thomas Gleixner]

On Thu, Jan 28 2021 at 16:29, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/core
> head:   997acaf6b4b59c6a9c259740312a69ea549cc684
> commit: 997acaf6b4b59c6a9c259740312a69ea549cc684 [10/10] lockdep: report broken irq restoration
> config: s390-randconfig-r035-20210128 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 48bdd676a1d1338c10541460bf5beb69ac17e451)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install s390 cross compiling tool for clang build
>         # apt-get install binutils-s390x-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=997acaf6b4b59c6a9c259740312a69ea549cc684
>         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 997acaf6b4b59c6a9c259740312a69ea549cc684
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All errors (new ones prefixed by >>):
>
>    s390x-linux-gnu-ld: arch/s390/boot/sclp_early_core.o: in function `sclp_early_cmd':
>>> sclp_early_core.c:(.text+0x18c): undefined reference to `warn_bogus_irq_restore'
>    s390x-linux-gnu-ld: arch/s390/boot/sclp_early_core.o: in function `sclp_early_set_event_mask':
>    sclp_early_core.c:(.text+0x376): undefined reference to `warn_bogus_irq_restore'
>    s390x-linux-gnu-ld: arch/s390/boot/sclp_early_core.o: in function `__sclp_early_printk':
>    sclp_early_core.c:(.text+0xa90): undefined reference to `warn_bogus_irq_restore'
>>> s390x-linux-gnu-ld: sclp_early_core.c:(.text+0xa9a): undefined reference to `warn_bogus_irq_restore'

That's S390 early boot code which lacks a stub function ....