linux-kernel - drivers/infiniband/core/.tmp_gl_uverbs_main.o:undefined reference to `__user

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Date:   Wed, 2 Jan 2019 02:33:41 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...lanox.com>
Subject: drivers/infiniband/core/.tmp_gl_uverbs_main.o:undefined reference to
 `__user_bad'

Hi Jason,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e1ef035d272ef4dbfdda98e58699698305138856
commit: 3a6532c9af1a7836da2d597f1aaca73cb16c3b97 RDMA/uverbs: Use uverbs_attr_bundle to pass udata for write
date:   5 weeks ago
config: microblaze-allyesconfig (attached as .config)
compiler: microblaze-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 3a6532c9af1a7836da2d597f1aaca73cb16c3b97
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=microblaze 

All errors (new ones prefixed by >>):

   `.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
   `.exit.data' referenced in section `.exit.text' of drivers/tty/n_hdlc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
   drivers/infiniband/core/uverbs_main.o: In function `ib_uverbs_write':
>> drivers/infiniband/core/.tmp_gl_uverbs_main.o:(.text+0x13a4): undefined reference to `__user_bad'
   drivers/android/binder.o: In function `binder_thread_write':
   drivers/android/.tmp_gl_binder.o:(.text+0xda6c): undefined reference to `__user_bad'
   drivers/android/.tmp_gl_binder.o:(.text+0xda98): undefined reference to `__user_bad'
   drivers/android/.tmp_gl_binder.o:(.text+0xdf10): undefined reference to `__user_bad'
   drivers/android/.tmp_gl_binder.o:(.text+0xe498): undefined reference to `__user_bad'
   drivers/android/binder.o:drivers/android/.tmp_gl_binder.o:(.text+0xea78): more undefined references to `__user_bad' follow

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