Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

Pull rcu/next + tools/memory-model changes from Paul E. McKenney:

 - RCU flavor consolidation cleanups and optmizations
 - Documentation updates
 - Miscellaneous fixes
 - SRCU updates
 - RCU-sync flavor consolidation
 - Torture-test updates
 - Linux-kernel memory-consistency-model updates, most notably the addition of plain C-language accesses

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 17 insertions, 6 deletions

diff --git a/kernel/torture.c b/kernel/torture.c
index 17b2be9bde12..a8d9bdfba7c3 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -570,6 +570,7 @@ static void torture_shutdown_cleanup(void)
 static struct task_struct *stutter_task;
 static int stutter_pause_test;
 static int stutter;
+static int stutter_gap;
 
 /*
  * Block until the stutter interval ends.  This must be called periodically
@@ -578,10 +579,12 @@ static int stutter;
 bool stutter_wait(const char *title)
 {
 	int spt;
+	bool ret = false;
 
 	cond_resched_tasks_rcu_qs();
 	spt = READ_ONCE(stutter_pause_test);
 	for (; spt; spt = READ_ONCE(stutter_pause_test)) {
+		ret = true;
 		if (spt == 1) {
 			schedule_timeout_interruptible(1);
 		} else if (spt == 2) {
@@ -592,7 +595,7 @@ bool stutter_wait(const char *title)
 		}
 		torture_shutdown_absorb(title);
 	}
-	return !!spt;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(stutter_wait);
 
@@ -602,17 +605,24 @@ EXPORT_SYMBOL_GPL(stutter_wait);
  */
 static int torture_stutter(void *arg)
 {
+	int wtime;
+
 	VERBOSE_TOROUT_STRING("torture_stutter task started");
 	do {
 		if (!torture_must_stop() && stutter > 1) {
-			WRITE_ONCE(stutter_pause_test, 1);
-			schedule_timeout_interruptible(stutter - 1);
+			wtime = stutter;
+			if (stutter > HZ + 1) {
+				WRITE_ONCE(stutter_pause_test, 1);
+				wtime = stutter - HZ - 1;
+				schedule_timeout_interruptible(wtime);
+				wtime = HZ + 1;
+			}
 			WRITE_ONCE(stutter_pause_test, 2);
-			schedule_timeout_interruptible(1);
+			schedule_timeout_interruptible(wtime);
 		}
 		WRITE_ONCE(stutter_pause_test, 0);
 		if (!torture_must_stop())
-			schedule_timeout_interruptible(stutter);
+			schedule_timeout_interruptible(stutter_gap);
 		torture_shutdown_absorb("torture_stutter");
 	} while (!torture_must_stop());
 	torture_kthread_stopping("torture_stutter");
@@ -622,9 +632,10 @@ static int torture_stutter(void *arg)
 /*
  * Initialize and kick off the torture_stutter kthread.
  */
-int torture_stutter_init(const int s)
+int torture_stutter_init(const int s, const int sgap)
 {
 	stutter = s;
+	stutter_gap = sgap;
 	return torture_create_kthread(torture_stutter, NULL, stutter_task);
 }
 EXPORT_SYMBOL_GPL(torture_stutter_init);