1 files changed, 79 insertions, 0 deletions

diff --git a/tools/testing/radix-tree/regression4.c b/tools/testing/radix-tree/regression4.c
new file mode 100644
index 000000000000..cf4e5aba6b08
--- /dev/null
+++ b/tools/testing/radix-tree/regression4.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/radix-tree.h>
+#include <linux/rcupdate.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <assert.h>
+
+#include "regression.h"
+
+static pthread_barrier_t worker_barrier;
+static int obj0, obj1;
+static RADIX_TREE(mt_tree, GFP_KERNEL);
+
+static void *reader_fn(void *arg)
+{
+        int i;
+        void *entry;
+
+        rcu_register_thread();
+        pthread_barrier_wait(&worker_barrier);
+
+        for (i = 0; i < 1000000; i++) {
+                rcu_read_lock();
+                entry = radix_tree_lookup(&mt_tree, 0);
+                rcu_read_unlock();
+                if (entry != &obj0) {
+                        printf("iteration %d bad entry = %p\n", i, entry);
+                        abort();
+                }
+        }
+
+        rcu_unregister_thread();
+
+        return NULL;
+}
+
+static void *writer_fn(void *arg)
+{
+        int i;
+
+        rcu_register_thread();
+        pthread_barrier_wait(&worker_barrier);
+
+        for (i = 0; i < 1000000; i++) {
+                radix_tree_insert(&mt_tree, 1, &obj1);
+                radix_tree_delete(&mt_tree, 1);
+        }
+
+        rcu_unregister_thread();
+
+        return NULL;
+}
+
+void regression4_test(void)
+{
+        pthread_t reader, writer;
+
+        printv(1, "regression test 4 starting\n");
+
+        radix_tree_insert(&mt_tree, 0, &obj0);
+        pthread_barrier_init(&worker_barrier, NULL, 2);
+
+        if (pthread_create(&reader, NULL, reader_fn, NULL) ||
+            pthread_create(&writer, NULL, writer_fn, NULL)) {
+                perror("pthread_create");
+                exit(1);
+        }
+
+        if (pthread_join(reader, NULL) || pthread_join(writer, NULL)) {
+                perror("pthread_join");
+                exit(1);
+        }
+
+        printv(1, "regression test 4 passed\n");
+}