Hi Arnd,

I love your patch! Yet something to improve:

[auto build test ERROR on soc/for-next]
[also build test ERROR on linus/master v5.13 next-20210630]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/mmc-warn-for-invalid-SDIO-data-buffers/20210630-202237
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: i386-randconfig-c001-20210630 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/256b826ee105fe46723b99c3f128ea01aa3e7adf
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Arnd-Bergmann/mmc-warn-for-invalid-SDIO-data-buffers/20210630-202237
        git checkout 256b826ee105fe46723b99c3f128ea01aa3e7adf
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

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: "is_vmalloc_or_module_addr" [drivers/mmc/core/mmc_core.ko] undefined!

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