Re: [PATCH tip/core/rcu 11/15] rcu: Avoid spurious RCU CPU stallwarnings

[Peter Zijlstra]

On Thu, 2012-08-30 at 11:56 -0700, Paul E. McKenney wrote:
> 
> If a given CPU avoids the idle loop but also avoids starting a new
> RCU grace period for a full minute, RCU can issue spurious RCU CPU
> stall warnings.  This commit fixes this issue by adding a check for
> ongoing grace period to avoid these spurious stall warnings. 

How would it avoid starting a new period for over a minute? fqs should
happen, right? And holding rcu_read_lock() for over a minute surely is a
bug.
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