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-rw-r--r--lib/Kconfig.debug10
-rw-r--r--lib/Makefile2
-rw-r--r--lib/test_ref_tracker.c115
3 files changed, 126 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5c12bde10996..633c2c5cb45b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2106,6 +2106,16 @@ config BACKTRACE_SELF_TEST
Say N if you are unsure.
+config TEST_REF_TRACKER
+ tristate "Self test for reference tracker"
+ depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
+ select REF_TRACKER
+ help
+ This option provides a kernel module performing tests
+ using reference tracker infrastructure.
+
+ Say N if you are unsure.
+
config RBTREE_TEST
tristate "Red-Black tree test"
depends on DEBUG_KERNEL
diff --git a/lib/Makefile b/lib/Makefile
index c1fd9243ddb9..b213a7bbf3fd 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -101,7 +101,7 @@ obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o
obj-$(CONFIG_TEST_HMM) += test_hmm.o
obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o
obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
-
+obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o
#
# CFLAGS for compiling floating point code inside the kernel. x86/Makefile turns
# off the generation of FPU/SSE* instructions for kernel proper but FPU_FLAGS
diff --git a/lib/test_ref_tracker.c b/lib/test_ref_tracker.c
new file mode 100644
index 000000000000..19d7dec70cc6
--- /dev/null
+++ b/lib/test_ref_tracker.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Referrence tracker self test.
+ *
+ * Copyright (c) 2021 Eric Dumazet <edumazet@google.com>
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/ref_tracker.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+
+static struct ref_tracker_dir ref_dir;
+static struct ref_tracker *tracker[20];
+
+#define TRT_ALLOC(X) static noinline void \
+ alloctest_ref_tracker_alloc##X(struct ref_tracker_dir *dir, \
+ struct ref_tracker **trackerp) \
+ { \
+ ref_tracker_alloc(dir, trackerp, GFP_KERNEL); \
+ }
+
+TRT_ALLOC(1)
+TRT_ALLOC(2)
+TRT_ALLOC(3)
+TRT_ALLOC(4)
+TRT_ALLOC(5)
+TRT_ALLOC(6)
+TRT_ALLOC(7)
+TRT_ALLOC(8)
+TRT_ALLOC(9)
+TRT_ALLOC(10)
+TRT_ALLOC(11)
+TRT_ALLOC(12)
+TRT_ALLOC(13)
+TRT_ALLOC(14)
+TRT_ALLOC(15)
+TRT_ALLOC(16)
+TRT_ALLOC(17)
+TRT_ALLOC(18)
+TRT_ALLOC(19)
+
+#undef TRT_ALLOC
+
+static noinline void
+alloctest_ref_tracker_free(struct ref_tracker_dir *dir,
+ struct ref_tracker **trackerp)
+{
+ ref_tracker_free(dir, trackerp);
+}
+
+
+static struct timer_list test_ref_tracker_timer;
+static atomic_t test_ref_timer_done = ATOMIC_INIT(0);
+
+static void test_ref_tracker_timer_func(struct timer_list *t)
+{
+ ref_tracker_alloc(&ref_dir, &tracker[0], GFP_ATOMIC);
+ atomic_set(&test_ref_timer_done, 1);
+}
+
+static int __init test_ref_tracker_init(void)
+{
+ int i;
+
+ ref_tracker_dir_init(&ref_dir, 100);
+
+ timer_setup(&test_ref_tracker_timer, test_ref_tracker_timer_func, 0);
+ mod_timer(&test_ref_tracker_timer, jiffies + 1);
+
+ alloctest_ref_tracker_alloc1(&ref_dir, &tracker[1]);
+ alloctest_ref_tracker_alloc2(&ref_dir, &tracker[2]);
+ alloctest_ref_tracker_alloc3(&ref_dir, &tracker[3]);
+ alloctest_ref_tracker_alloc4(&ref_dir, &tracker[4]);
+ alloctest_ref_tracker_alloc5(&ref_dir, &tracker[5]);
+ alloctest_ref_tracker_alloc6(&ref_dir, &tracker[6]);
+ alloctest_ref_tracker_alloc7(&ref_dir, &tracker[7]);
+ alloctest_ref_tracker_alloc8(&ref_dir, &tracker[8]);
+ alloctest_ref_tracker_alloc9(&ref_dir, &tracker[9]);
+ alloctest_ref_tracker_alloc10(&ref_dir, &tracker[10]);
+ alloctest_ref_tracker_alloc11(&ref_dir, &tracker[11]);
+ alloctest_ref_tracker_alloc12(&ref_dir, &tracker[12]);
+ alloctest_ref_tracker_alloc13(&ref_dir, &tracker[13]);
+ alloctest_ref_tracker_alloc14(&ref_dir, &tracker[14]);
+ alloctest_ref_tracker_alloc15(&ref_dir, &tracker[15]);
+ alloctest_ref_tracker_alloc16(&ref_dir, &tracker[16]);
+ alloctest_ref_tracker_alloc17(&ref_dir, &tracker[17]);
+ alloctest_ref_tracker_alloc18(&ref_dir, &tracker[18]);
+ alloctest_ref_tracker_alloc19(&ref_dir, &tracker[19]);
+
+ /* free all trackers but first 0 and 1. */
+ for (i = 2; i < ARRAY_SIZE(tracker); i++)
+ alloctest_ref_tracker_free(&ref_dir, &tracker[i]);
+
+ /* Attempt to free an already freed tracker. */
+ alloctest_ref_tracker_free(&ref_dir, &tracker[2]);
+
+ while (!atomic_read(&test_ref_timer_done))
+ msleep(1);
+
+ /* This should warn about tracker[0] & tracker[1] being not freed. */
+ ref_tracker_dir_exit(&ref_dir);
+
+ return 0;
+}
+
+static void __exit test_ref_tracker_exit(void)
+{
+}
+
+module_init(test_ref_tracker_init);
+module_exit(test_ref_tracker_exit);
+
+MODULE_LICENSE("GPL v2");