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
