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From:   Leon Romanovsky <leonro@mellanox.com>
To:     Randy Dunlap <rdunlap@infradead.org>
CC:     kbuild test robot <lkp@intel.com>,
        Jason Gunthorpe <jgg@mellanox.com>,
        "kbuild-all@01.org" <kbuild-all@01.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Michal Simek <monstr@monstr.eu>
Subject: Re: drivers/infiniband/core/.tmp_gl_uverbs_main.o:undefined reference
 to `__user_bad'
Thread-Topic: drivers/infiniband/core/.tmp_gl_uverbs_main.o:undefined
 reference to `__user_bad'
Thread-Index: AQHVS0le9ZStzbxzQU+1jMhieiDmg6br/7AA
Date:   Mon, 5 Aug 2019 05:03:36 +0000
Message-ID: <20190805050334.GL4832@mtr-leonro.mtl.com>
References: <201902281750.jbpT0s0R%fengguang.wu@intel.com>
 <646013c8-5fcd-e7ab-0a87-3e0620563dfb@infradead.org>
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On Sun, Aug 04, 2019 at 09:50:50PM -0700, Randy Dunlap wrote:
> On 4/2/19 7:38 PM, Randy Dunlap wrote:
> > On 2/28/19 1:03 AM, kbuild test robot wrote:
> >> Hi Jason,
> >>
> >> FYI, the error/warning still remains.
> >>
> >> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux=
.git master
> >> head:   7d762d69145a54d169f58e56d6dac57a5508debc
> >> commit: 3a6532c9af1a7836da2d597f1aaca73cb16c3b97 RDMA/uverbs: Use uver=
bs_attr_bundle to pass udata for write
> >> date:   3 months ago
> >> config: microblaze-allyesconfig (attached as .config)
> >> compiler: microblaze-linux-gcc (GCC) 8.2.0
> >> 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=3D8.2.0 make.cross ARCH=3Dmicroblaze
> >>
> >> All errors (new ones prefixed by >>):
> >>
> >>    `.exit.data' referenced in section `.exit.text' of drivers/tty/n_hd=
lc.o: defined in discarded section `.exit.data' of drivers/tty/n_hdlc.o
> >>    `.exit.data' referenced in section `.exit.text' of drivers/tty/n_hd=
lc.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): undefi=
ned reference to `__user_bad'
> >>    drivers/android/binder.o: In function `binder_thread_write':
> >>    drivers/android/.tmp_gl_binder.o:(.text+0xda6c): undefined referenc=
e to `__user_bad'
> >>    drivers/android/.tmp_gl_binder.o:(.text+0xda98): undefined referenc=
e to `__user_bad'
> >>    drivers/android/.tmp_gl_binder.o:(.text+0xdf10): undefined referenc=
e to `__user_bad'
> >>    drivers/android/.tmp_gl_binder.o:(.text+0xe498): undefined referenc=
e to `__user_bad'
> >>    drivers/android/binder.o:drivers/android/.tmp_gl_binder.o:(.text+0x=
ea78): more undefined references to `__user_bad' follow
> >>
> >> ---
> >> 0-DAY kernel test infrastructure                Open Source Technology=
 Center
> >> https://lists.01.org/pipermail/kbuild-all                   Intel Corp=
oration
> >
> > Hi Michal,
> >
> > Would you comment on this, please?
>
> [crickets]
>
> > Jason has said more than once that these build errors are because
> > arch/microblaze does not support get_user() of size 8 (bytes),
> > although it does support a put_user() of size 8.
> >
> >
> > See a previous report & comment at
> > https://lore.kernel.org/lkml/20190101200742.GA5757@mellanox.com/
> >
> >
> > thanks.
>
> I currently don't have a cross-build environment set up, so I haven't
> built this yet, but a patch like this might fix this nagging issue.
>
> (It's clearly not high priority since arch/microblaze/ mostly seems to be
> not well-maintained.)

It seems reasonable, drivers/infiniband/* never worked and will work on
that architecture.

Thanks