On Tue, 2 Sep 2014, Paul E. McKenney wrote:

> Before this commit, raw_cpu_add_return() didn't build.  The commit
> didn't affect anything else.
>
> So I don't understand how anything could work before this commit and
> be broken after it.  Enlightenment?

Where is that raw_cpu_add_return statement?

grep does not match anything like that in kernel/rcu/*
and this_cpu_add_return is used extensively in the network subsystem for
statistics.