linux-kernel - [PATCH 3/3] lib/test_vmalloc.c: introduce two new test cases

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Date:   Thu,  2 Apr 2020 14:32:53 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>
Cc:     RCU <rcu@...r.kernel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: [PATCH 3/3] lib/test_vmalloc.c: introduce two new test cases

Introduce two more test cases which are specific for RCU
freeing of vmalloc pointer. One test case is for object
that has rcu_head inside and second one is for headless
testing.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 lib/test_vmalloc.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index 8bbefcaddfe8..1734ba7fc400 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/rwsem.h>
 #include <linux/mm.h>
+#include <linux/rcupdate.h>
 
 #define __param(type, name, init, msg)		\
 	static type name = init;				\
@@ -43,6 +44,8 @@ __param(int, run_test_mask, INT_MAX,
 		"\t\tid: 32,  name: random_size_align_alloc_test\n"
 		"\t\tid: 64,  name: align_shift_alloc_test\n"
 		"\t\tid: 128, name: pcpu_alloc_test\n"
+		"\t\tid: 256, name: kvfree_rcu_with_head_test\n"
+		"\t\tid: 512, name: kvfree_rcu_head_less_test\n"
 		/* Add a new test case description here. */
 );
 
@@ -328,6 +331,49 @@ pcpu_alloc_test(void)
 	return rv;
 }
 
+struct test_kvfree_rcu {
+	struct rcu_head rcu;
+	unsigned char array[100];
+};
+
+static int
+kvfree_rcu_with_head_test(void)
+{
+	struct test_kvfree_rcu *p;
+	int i;
+
+	for (i = 0; i < test_loop_count; i++) {
+		p = vmalloc(1 * PAGE_SIZE);
+
+		if (!p)
+			return -1;
+
+		p->array[0] = 'a';
+		kvfree_rcu(p, rcu);
+	}
+
+	return 0;
+}
+
+static int
+kvfree_rcu_head_less_test(void)
+{
+	struct test_kvfree_rcu *p;
+	int i;
+
+	for (i = 0; i < test_loop_count; i++) {
+		p = vmalloc(1 * PAGE_SIZE);
+
+		if (!p)
+			return -1;
+
+		p->array[0] = 'a';
+		kvfree_rcu(p);
+	}
+
+	return 0;
+}
+
 struct test_case_desc {
 	const char *test_name;
 	int (*test_func)(void);
@@ -342,6 +388,8 @@ static struct test_case_desc test_case_array[] = {
 	{ "random_size_align_alloc_test", random_size_align_alloc_test },
 	{ "align_shift_alloc_test", align_shift_alloc_test },
 	{ "pcpu_alloc_test", pcpu_alloc_test },
+	{ "kvfree_rcu_with_head_test", kvfree_rcu_with_head_test },
+	{ "kvfree_rcu_head_less_test", kvfree_rcu_head_less_test },
 	/* Add a new test case here. */
 };
 
-- 
2.20.1