Messages in this thread | | | Date | Wed, 20 Jul 2011 14:39:23 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH rcu/urgent 0/6] Fixes for RCU/scheduler/irq-threads trainwreck |
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On Wed, Jul 20, 2011 at 11:05:53PM +0200, Peter Zijlstra wrote: > On Wed, 2011-07-20 at 12:29 -0700, Paul E. McKenney wrote: > > > Peter, does #4 (protect __rcu_read_unlock() against scheduler-using > > irq handlers) remove the need for #5 (Add irq_{enter,exit}() to > > scheduler_ipi()) and #6 (Inform RCU of irq_exit() activity)? My guess is > > "no" for #5 and "yes" for #6. > > More or less, we want to keep #5 for it does more than just fix RCU, but > yeah, I _think_ #4 obsoletes the direct need for #6.
Heh. So the lowest risk is keeping #6 for now and deciding later whether we really need it.
Thanx, Paul
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