linux-kernel - Re: [rcu:dev.2020.05.26b 51/70] powerpc64-linux-ld: kernel/rcu/refperf.o:(.discard+0x0): multiple definition of `__pcpu_unique_srcu_ctl_perf_srcu_data'; kernel/rcu/rcuperf.o:(.discard+0x0): first defined here

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Date:   Wed, 27 May 2020 12:43:19 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [rcu:dev.2020.05.26b 51/70] powerpc64-linux-ld:
 kernel/rcu/refperf.o:(.discard+0x0): multiple definition of
 `__pcpu_unique_srcu_ctl_perf_srcu_data';
 kernel/rcu/rcuperf.o:(.discard+0x0): first defined here

On Thu, May 28, 2020 at 12:17:23AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.05.26b
> head:   795279db1396bf66621fa3f343fa990fe543b89e
> commit: 786a25497743696d79592b864cafbfe48787e6e1 [51/70] refperf: Add a test to measure performance of read-side synchronization
> config: powerpc-allyesconfig (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
>         git checkout 786a25497743696d79592b864cafbfe48787e6e1
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> powerpc64-linux-ld: kernel/rcu/refperf.o:(.discard+0x0): multiple definition of `__pcpu_unique_srcu_ctl_perf_srcu_data'; kernel/rcu/rcuperf.o:(.discard+0x0): first defined here

Ah, yes, despite the "static" keyword, the names must be unique throughout
the kernel.  Will fix!

							Thanx, Paul