Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU

Paul E. McKenney
2009-08-25T16:12:11Z

On Tue, Aug 25, 2009 at 10:00:47AM +0200, Ingo Molnar wrote:
>
> btw., i'm still seeing crashes with the latest RCU bits:
>
> [ 20.621740] Testing event sys_enter_futex: OK
> [ 20.629738] Testing event sys_exit_futex: OK
> [ 20.637737] Testing event lock_acquire: [reboot]
>
> Possibly due to infinite recursion as well. Config attached.

Color me confused...

Unless someone has a better idea, I will send in a patch that adds
"notrace" to every RCU API member used by any file in the kernel
that has "trace" in its name (excluding ptrace.c and rcutree_trace.c,
of course). This list is as follows:

call_rcu()
call_rcu_sched()
rcu_read_lock()
rcu_read_unlock()

So, any better ideas?

Thanx, Paul