Re: [PATCH v3 13/22] tracing: Remove regular RCU context for _rcuidle tracepoints (again)

[Steven Rostedt]

On Wed, 19 Feb 2020 09:40:25 -0800
"Paul E. McKenney" <paulmck@xxxxxxxxxx> wrote:

> > Correct, and if rcuidle is not set, and this is a macro, the SRCU
> > portion is compiled out.  
> 
> Sigh!  Apologies for the noise!
> 
> If we are using SRCU, we don't care whether or not RCU is watching.  OK,
> maybe finally catching up -- the whole point was use of RCU in other
> tracing code, wasn't it?

Some callbacks (namely perf) might use RCU, but then the callbacks
need to make sure rcu is watching.

-- Steve