rcutorture: Abstract torture_shuffle()

The torture_shuffle() function forces each CPU in turn to go idle
periodically in order to check for problems interacting with per-CPU
variables and with dyntick-idle mode.  Because this sort of debugging
is not specific to RCU, this commit abstracts that functionality.
This in turn requires abstracting some additional infrastructure.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/torture.h b/include/linux/torture.h
index 8474d776c864..544a2c33c1ae 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -69,6 +69,11 @@ struct torture_random_state {
 #define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
 unsigned long torture_random(struct torture_random_state *trsp);
 
+/* Task shuffler, which causes CPUs to occasionally go idle. */
+void torture_shuffle_task_register(struct task_struct *tp);
+int torture_shuffle_init(long shuffint);
+void torture_shuffle_cleanup(void);
+
 /* Shutdown task absorption, for when the tasks cannot safely be killed. */
 void torture_shutdown_absorb(const char *title);