linux-kernel - Re: [rcu:rcu/next 91/91] ftrace.c:undefined reference to `synchronize_rcu

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Message-Id: <20170521205131.GI3956@linux.vnet.ibm.com>
Date:   Sun, 21 May 2017 13:51:31 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org
Subject: Re: [rcu:rcu/next 91/91] ftrace.c:undefined reference to
 `synchronize_rcu_tasks'

On Mon, May 22, 2017 at 03:16:42AM +0800, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
> head:   f1b89dcf23ef0999fae8bbc34cc9eb3fe00bc677
> commit: f1b89dcf23ef0999fae8bbc34cc9eb3fe00bc677 [91/91] rcu: Remove Tasks RCU
> config: x86_64-acpi-redef (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>         git checkout f1b89dcf23ef0999fae8bbc34cc9eb3fe00bc677
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel/built-in.o: In function `ftrace_shutdown':
> >> ftrace.c:(.text+0x9142d): undefined reference to `synchronize_rcu_tasks'

Expected behavior, so I should have used "experimental".  I will be providing
a new implementation of synchronize_rcu_tasks() "real soon now".

							Thanx, Paul