linux-kernel - Re: powerpc64-linux-ld: arch/powerpc/mm/numa.o:undefined reference to `coregroup

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Date:   Mon, 23 Nov 2020 20:33:12 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Subject: Re: powerpc64-linux-ld: arch/powerpc/mm/numa.o:undefined reference
 to `coregroup_enabled'

* Randy Dunlap <rdunlap@...radead.org> [2020-11-19 15:51:29]:

> On 11/19/20 10:26 AM, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   c2e7554e1b85935d962127efa3c2a76483b0b3b6
> > commit: f9f130ff2ec93c5949576bbfb168cc9530c23649 powerpc/numa: Detect support for coregroup
> > date:   9 weeks ago
> > config: powerpc64-randconfig-c003-20201104 (attached as .config)
> > compiler: powerpc64-linux-gcc (GCC) 9.3.0
> > reproduce (this is a W=1 build):
> >          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >          chmod +x ~/bin/make.cross
> >          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9f130ff2ec93c5949576bbfb168cc9530c23649
> >          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >          git fetch --no-tags linus master
> >          git checkout f9f130ff2ec93c5949576bbfb168cc9530c23649
> >          # save the attached .config to linux build tree
> >          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc64
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All errors (new ones prefixed by >>):
> > 
> > > > powerpc64-linux-ld: arch/powerpc/mm/numa.o:(.toc+0x0): undefined reference to `coregroup_enabled'
> >     powerpc64-linux-ld: mm/page_alloc.o:(.toc+0x0): undefined reference to `node_reclaim_distance'
> >     powerpc64-linux-ld: mm/khugepaged.o:(.toc+0x0): undefined reference to `node_reclaim_distance'
> 
> Hm, OK.
> CONFIG_NUMA=y
> # CONFIG_SMP is not set
> 
> Michael, Gautham, does anyone care about this config combination?
> 

I can add #ifdef CONFIG_SMP where coregroup_enabled is being accessed
but I do feel CONFIG_NUMA but !CONFIG_SMP may not be a valid combination.

> 
> Thanks.

-- 
Thanks and Regards
Srikar Dronamraju