Re: [PATCH tip/core/rcu 0/13] Torture-test updates for 4.2

[josh@joshtriplett.org]

On Tue, May 12, 2015 at 03:57:53PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series contains torture-test updates:
> 
> 1.	Use correct locking primitive, thus avoiding deadlock, courtesy
> 	of Alexey Kodanev.
> 
> 2.	Exchange TREE03 and TREE04 geometries in order to improve bug-location
> 	rates.
> 
> 3.	Exchange TREE03 and TREE08 NR_CPUS, speed up CPU hotplug to further
> 	improve bug-location rates.
> 
> 4.	Allow negative values of nreaders to in order to oversubscribe
> 	the CPUs, again to improve bug-location rates.
> 
> 5.	Change longdelay_us to longdelay_ms in order to better reflect
> 	reality.  (Not that gcc cares, but people reading the code just
> 	might.)
> 
> 6.	Replace open-coded memory barriers with the shiny new
> 	smp_store_release() and smp_load_acquire() primitives.
> 
> 7.	Test SRCU cleanup code path in order to improve test coverage.
> 
> 8.	Avoid explicitly setting CONFIG_TASKS_RCU, given that it is
> 	now set implicitly based on other configuration options.
> 
> 9.	Update configuration fragments from CONFIG_RCU_FANOUT_EXACT to
> 	the new rcutree.rcu_fanout_exact= boot parameter.
> 
> 10.	Make rcutorture scripts force RCU_EXPERT so that they can still
> 	build the needed kernel configurations.
> 
> 11.	Update TREE_RCU-kconfig.txt to describe new kernel-parameter
> 	setup.
> 
> 12.	Make torture scripts display "make oldconfig" errors
> 
> 13.	Allow repetition factors in Kconfig-fragment lists.  Because
> 	typing 48 repetitions of "TINY02" is getting old.

I replied to patches 4 and 11 with feedback.  For the rest:

Reviewed-by: Josh Triplett <josh@joshtriplett.org>