[staging:staging-testing 14/19] ERROR: "cs5535_gpio_set" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!

[staging:staging-testing 14/19] ERROR: "cs5535_gpio_set" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!

[kbuild test robot]

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tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/staging.git staging-testing
head:   3f1962fdc723cb48f0ea4e8a733d3ffa88708e98
commit: a3f54564061da0c8c0b60033ff44acfa356b8779 [14/19] staging: olpc_dcon: allow simultaneous XO-1 and XO-1.5 support
config: i386-randconfig-c001-201938 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        git checkout a3f54564061da0c8c0b60033ff44acfa356b8779
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

>> ERROR: "cs5535_gpio_set" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!
>> ERROR: "cs5535_gpio_set_irq" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!
>> ERROR: "cs5535_gpio_clear" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!
>> ERROR: "cs5535_gpio_setup_event" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!
>> ERROR: "cs5535_gpio_isset" [drivers/staging/olpc_dcon/olpc-dcon.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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