linux-kernel - Re: mm/slub.o:undefined reference to `_GLOBAL_OFFSET_TABLE

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Date:   Thu, 22 Sep 2016 10:29:46 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Alexander Duyck <alexander.h.duyck@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        brouer@...hat.com
Subject: Re: mm/slub.o:undefined reference to `_GLOBAL_OFFSET_TABLE_'

On Thu, 22 Sep 2016 13:50:21 +0800
kbuild test robot <fengguang.wu@...el.com> wrote:

> Hi Jesper,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   7d1e042314619115153a0f6f06e4552c09a50e13
> commit: d0ecd894e3d5f768a84403b34019c4a7daa05882 slub: optimize bulk slowpath free by detached freelist
> date:   10 months ago
> config: microblaze-allnoconfig (attached as .config)
> compiler: microblaze-linux-gcc (GCC) 6.2.0
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout d0ecd894e3d5f768a84403b34019c4a7daa05882
>         # save the attached .config to linux build tree
>         make.cross ARCH=microblaze 
> 
> All errors (new ones prefixed by >>):
> 
>    mm/built-in.o: In function `__slab_free.isra.14':
> >> mm/slub.o:(.text+0x28d1c): undefined reference to `_GLOBAL_OFFSET_TABLE_'  
>    scripts/link-vmlinux.sh: line 52: 18051 Segmentation fault      ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} -T ${lds} ${KBUILD_VMLINUX_INIT} --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}

Hi Fengguang,

I don't really understand if this is a real bug that I need to fix?

It looks like a linker problem, resulting in a "Segmentation fault" for your script...

The mentioned commit: d0ecd894e3d5f768a84 removes a call point to
__slab_free() and instead call slab_free().  It does not make sense to
my, why this results in a linker error on this ARCH=microblaze.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer