Hello, Paul. On Tue, Jul 03, 2018 at 09:40:44AM -0700, Paul E. McKenney wrote: > > I will apply this, but be advised that I have not seen that WARN_ON_ONCE() > > trigger since. :-/ > > But I get a build error: > > kernel/workqueue.o: In function `worker_attach_to_pool': > workqueue.c:(.text+0x63c): undefined reference to `cpuhp_target_state' > workqueue.c:(.text+0x647): undefined reference to `cpuhp_current_state' > /home/paulmck/public_git/linux-rcu/Makefile:1015: recipe for target 'vmlinux' > failed > > My guess is that the worker_attach_to_pool() code needs to change so > as to invoke cpuhp_current_state() and cpuhp_target_state() only in > CONFIG_HOTPLUG_CPU=y kernels, but I figured I should defer to you.
Just to clarify, the bug happened on a kernel with cpuhp enabled, right? Thanks. -- tejun
