Re: [PATCH RFC] rcu: Make __rcu_read_lock() inlinable

[Steven Rostedt]

On Mon, 2012-03-26 at 22:15 -0700, Paul E. McKenney wrote:

> Hmmm...  I am not yet sure whether it is easier to make RCU use legal
> in switch_to() or to detect it.  I am inclined to take whatever course
> is easiest, which is likely to make it legal.  :-/

We could just declare that we do not allow tracepoints in arch specific
"switch_to" code. Then you shouldn't need to worry about RCU in
switch_to().

sched_rcu can still work there correct? That is, a synchronize_sched()
should not be affected. As that is needed for the function tracing, and
that may be called within a switch_to.

-- Steve


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