From 6ed04ca462c9273acb990144b79c01ebf0c8d102 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 17 Jun 2018 18:25:15 +0200
Subject: selftest/mpmc_ring: use completion and switch to ptr_ring

---
 src/selftest/mpmc_ring.h | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/src/selftest/mpmc_ring.h b/src/selftest/mpmc_ring.h
index 54250d7..1dc92fd 100644
--- a/src/selftest/mpmc_ring.h
+++ b/src/selftest/mpmc_ring.h
@@ -8,6 +8,7 @@
 
 #include "../mpmc_ptr_ring.h"
 #include <linux/kthread.h>
+#include <linux/ptr_ring.h>
 
 #define THREADS_PRODUCER 20
 #define THREADS_CONSUMER 20
@@ -20,12 +21,14 @@
 #define THREADS_TOTAL (THREADS_PRODUCER + THREADS_CONSUMER)
 
 struct worker_producer {
-	struct mpmc_ptr_ring *ring;
+	struct ptr_ring *ring;
+	struct completion completion;
 	int thread_num;
 };
 
 struct worker_consumer {
-	struct mpmc_ptr_ring *ring;
+	struct ptr_ring *ring;
+	struct completion completion;
 	uint64_t total;
 	uint64_t count;
 };
@@ -36,11 +39,12 @@ static __init int producer_function(void *data)
 	uint64_t i;
 
 	for (i = td->thread_num * PER_PRODUCER + 1; i <= (td->thread_num + 1) * PER_PRODUCER; ++i) {
-		while (mpmc_ptr_ring_produce(td->ring, (void *)i)) {
+		while (ptr_ring_produce(td->ring, (void *)i)) {
 			if (need_resched())
 				schedule();
 		}
 	}
+	complete_all(&td->completion);
 	return 0;
 }
 
@@ -51,7 +55,7 @@ static __init int consumer_function(void *data)
 
 	for (i = 0; i < PER_CONSUMER; ++i) {
 		uintptr_t value;
-		while (!(value = (uintptr_t)mpmc_ptr_ring_consume(td->ring))) {
+		while (!(value = (uintptr_t)ptr_ring_consume(td->ring))) {
 			if (need_resched())
 				schedule();
 		}
@@ -59,6 +63,7 @@ static __init int consumer_function(void *data)
 		td->total += value;
 		++td->count;
 	}
+	complete_all(&td->completion);
 	return 0;
 }
 
@@ -66,36 +71,38 @@ bool __init mpmc_ring_selftest(void)
 {
 	struct worker_producer *producers;
 	struct worker_consumer *consumers;
-	struct task_struct **threads;
-	struct mpmc_ptr_ring ring;
+	struct ptr_ring ring;
 	int64_t total = 0, count = 0;
-	int i, j = 0;
+	int i;
 
 	producers = kmalloc_array(THREADS_PRODUCER, sizeof(*producers), GFP_KERNEL);
 	consumers = kmalloc_array(THREADS_CONSUMER, sizeof(*consumers), GFP_KERNEL);
-	threads = kmalloc_array(THREADS_CONSUMER + THREADS_PRODUCER, sizeof(*threads), GFP_KERNEL);
 
-	BUG_ON(!producers || !consumers || !threads);
-	BUG_ON(mpmc_ptr_ring_init(&ring, QUEUE_SIZE, GFP_KERNEL));
+	BUG_ON(!producers || !consumers);
+	BUG_ON(ptr_ring_init(&ring, QUEUE_SIZE, GFP_KERNEL));
 
 	for (i = 0; i < THREADS_PRODUCER; ++i) {
 		producers[i].ring = &ring;
 		producers[i].thread_num = i;
-		threads[j++] = kthread_run(producer_function, &producers[i], "producer %d", i);
+		init_completion(&producers[i].completion);
+		kthread_run(producer_function, &producers[i], "producer %d", i);
 	}
 
 	for (i = 0; i < THREADS_CONSUMER; ++i) {
 		consumers[i].ring = &ring;
 		consumers[i].total = 0;
 		consumers[i].count = 0;
-		threads[j++] = kthread_run(consumer_function, &consumers[i], "consumer %d", i);
+		init_completion(&consumers[i].completion);
+		kthread_run(consumer_function, &consumers[i], "consumer %d", i);
 	}
 
-	for (j = 0; j < THREADS_CONSUMER + THREADS_PRODUCER; ++j)
-		kthread_stop(threads[j]);
+	for (i = 0; i < THREADS_PRODUCER; ++i)
+		wait_for_completion(&producers[i].completion);
+	for (i = 0; i < THREADS_CONSUMER; ++i)
+		wait_for_completion(&consumers[i].completion);
 
-	BUG_ON(!mpmc_ptr_ring_empty(&ring));
-	mpmc_ptr_ring_cleanup(&ring, NULL);
+	BUG_ON(!ptr_ring_empty(&ring));
+	ptr_ring_cleanup(&ring, NULL);
 
 	for (i = 0; i < THREADS_CONSUMER; ++i) {
 		total += consumers[i].total;
@@ -104,7 +111,6 @@ bool __init mpmc_ring_selftest(void)
 
 	kfree(producers);
 	kfree(consumers);
-	kfree(threads);
 
 	if (count == ELEMENT_COUNT && total == EXPECTED_TOTAL) {
 		pr_info("mpmc_ring self-tests: pass");
-- 
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