tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git genirq
head:   53cc7c5b089bb7f673fc14f830c4a5d665812b1d
commit: 625bfc682a550bc6ab8d05a49c0204f026a66aa3 [29/56] genirq: Move irq_set_lockdep_class() to core
config: x86_64-randconfig-s022-20201209 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-179-ga00755aa-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=625bfc682a550bc6ab8d05a49c0204f026a66aa3
        git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
        git fetch --no-tags tglx-devel genirq
        git checkout 625bfc682a550bc6ab8d05a49c0204f026a66aa3
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "__irq_set_lockdep_class" [drivers/net/dsa/mv88e6xxx/mv88e6xxx.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org