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From:   Martijn Coenen <maco@google.com>
Date:   Mon, 2 Jul 2018 11:27:20 +0200
Message-ID: <CA+_MTtzgL2pNY3nu6xTAKWdSYKWHEyWXM6PSA8iFMK-Pub2z1w@mail.gmail.com>
Subject: Re: drivers/android/.tmp_gl_binder.o:undefined reference to `__user_bad'
To:     monstr@monstr.eu
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Greg KH <gregkh@linuxfoundation.org>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi Michal,

See below - this error was introduced because the binder driver uses a
64-bit get_user(), even on a 32-bit architecture. Would it be possible
to implement a 64-bit get_user() for microblaze?

Thanks,
Martijn

On Mon, Jul 2, 2018 at 6:53 AM kbuild test robot <lkp@intel.com> wrote:
>
> Hi Martijn,
>
> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   021c91791a5e7e85c567452f1be3e4c2c6cb6063
> commit: 1190b4e38f97023154e6b3bef61b251aa5f970d0 ANDROID: binder: remove 32-bit binder interface.
> date:   7 weeks ago
> config: microblaze-allmodconfig (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 1190b4e38f97023154e6b3bef61b251aa5f970d0
>         # save the attached .config to linux build tree
>         GCC_VERSION=8.1.0 make.cross ARCH=microblaze
>
> All errors (new ones prefixed by >>):
>
>    drivers/android/binder.o: In function `binder_thread_write':
> >> drivers/android/.tmp_gl_binder.o:(.text+0xcbb0): undefined reference to `__user_bad'
>    drivers/android/.tmp_gl_binder.o:(.text+0xcbdc): undefined reference to `__user_bad'
>    drivers/android/.tmp_gl_binder.o:(.text+0xcfc4): undefined reference to `__user_bad'
>    drivers/android/.tmp_gl_binder.o:(.text+0xd650): undefined reference to `__user_bad'
>    drivers/android/.tmp_gl_binder.o:(.text+0xdbc8): undefined reference to `__user_bad'
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation