linux-kernel - Re: [rcu:dev.2020.12.15b 128/134] ERROR: modpost: "rcu_nocb_cpu

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Date:   Sat, 19 Dec 2020 11:06:25 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [rcu:dev.2020.12.15b 128/134] ERROR: modpost:
 "rcu_nocb_cpu_deoffload" undefined!

On Sun, Dec 20, 2020 at 01:37:07AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.12.15b
> head:   f895a17eec290b0038a6294d884a9cc92d7d6e80
> commit: 892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa [128/134] rcutorture: Test runtime toggling of CPUs' callback offloading
> config: x86_64-rhel (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa
>         git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
>         git fetch --no-tags rcu dev.2020.12.15b
>         git checkout 892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa
>         # save the attached .config to linux build tree
>         make W=1 ARCH=x86_64 
> 
> 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 >>, old ones prefixed by <<):
> 
> >> ERROR: modpost: "rcu_nocb_cpu_deoffload" [kernel/rcu/rcutorture.ko] undefined!

Good catch!  I have queued a fix to be squashed into the original
with attribution.

							Thanx, Paul