Re: drivers/infiniband/core/.tmp_gl_uverbs_main.o:undefined reference to `__user_bad'

[Jason Gunthorpe <jgg@mellanox.com>]

On Wed, Jan 02, 2019 at 02:33:41AM +0800, kbuild test robot wrote:
> Hi Jason,
> 
> FYI, the error/warning still remains.

Like binder, DRM, etc, uverbs requires architectures to support 8 byte
get_user/put_user.

For some reason microblaze only supports 8 byte for put_user, so it
fails to compile.

I don't see a reason to change uverbs here, I think microblaze should
be fixed, then it would fix all the cases below.

Jason

> 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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