On Tue, Sep 02, 2014 at 11:00:12AM -0500, Christoph Lameter wrote:
> 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.
Heh! Good point!
Added by ac1bea85781e (sched,rcu: Make cond_resched() report RCU quiescent
states), removed by 4a81e8328d379 (rcu: Reduce overhead of cond_resched()
checks for RCU). So, as you say, no effect on contemporary kernels.
Thanx, Paul
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