linux-kernel - ERROR: "uio_unregister_device" [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!

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Date:   Tue, 14 May 2019 10:43:19 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: ERROR: "uio_unregister_device"
 [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!

Hi Greg,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   63863ee8e2f6f6ae47be3dff4af2f2806f5ca2dd
commit: 91b6cb7216cd8bad027bc9ef88e2834786c8eeaf staging: kpc2000: fix up build problems with readq()
date:   13 days ago
config: i386-randconfig-k1-05131404 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 91b6cb7216cd8bad027bc9ef88e2834786c8eeaf
        # 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@...el.com>

All errors (new ones prefixed by >>):

>> ERROR: "uio_unregister_device" [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!
>> ERROR: "__uio_register_device" [drivers/staging/kpc2000/kpc2000/kpc2000.ko] undefined!

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