linux-kernel - [PATCH RFC 3/3] kfence: Make test case compatible with run time set sample interval

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Date:   Mon, 24 Jan 2022 02:52:05 +0000
From:   Peng Liu <liupeng256@...wei.com>
To:     <glider@...gle.com>, <elver@...gle.com>, <dvyukov@...gle.com>,
        <corbet@....net>, <sumit.semwal@...aro.org>,
        <christian.koenig@....com>, <akpm@...ux-foundation.org>
CC:     <kasan-dev@...glegroups.com>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linaro-mm-sig@...ts.linaro.org>,
        <linux-mm@...ck.org>, <liupeng256@...wei.com>
Subject: [PATCH RFC 3/3] kfence: Make test case compatible with run time set sample interval

The parameter kfence_sample_interval can be set via boot parameter
and late shell command. However, KFENCE test case just use compile
time CONFIG_KFENCE_SAMPLE_INTERVAL, this will make KFENCE test case
not run as user desired. This patch will make KFENCE test case
compatible with run-time-set sample interval.

Signed-off-by: Peng Liu <liupeng256@...wei.com>
---
 include/linux/kfence.h  | 2 ++
 mm/kfence/core.c        | 3 ++-
 mm/kfence/kfence_test.c | 8 ++++----
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/linux/kfence.h b/include/linux/kfence.h
index bf91b76b87ee..0fc913a7f017 100644
--- a/include/linux/kfence.h
+++ b/include/linux/kfence.h
@@ -19,6 +19,8 @@
 
 extern bool kfence_enabled;
 extern unsigned long kfence_num_objects;
+extern unsigned long kfence_sample_interval;
+
 /*
  * We allocate an even number of pages, as it simplifies calculations to map
  * address to metadata indices; effectively, the very first page serves as an
diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 2301923182b8..e2fcae34cc84 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -50,7 +50,8 @@
 
 bool kfence_enabled __read_mostly;
 
-static unsigned long kfence_sample_interval __read_mostly = CONFIG_KFENCE_SAMPLE_INTERVAL;
+unsigned long kfence_sample_interval __read_mostly = CONFIG_KFENCE_SAMPLE_INTERVAL;
+EXPORT_SYMBOL(kfence_sample_interval); /* Export for test modules. */
 
 #ifdef MODULE_PARAM_PREFIX
 #undef MODULE_PARAM_PREFIX
diff --git a/mm/kfence/kfence_test.c b/mm/kfence/kfence_test.c
index 084e3a55aebb..97ff3a133f11 100644
--- a/mm/kfence/kfence_test.c
+++ b/mm/kfence/kfence_test.c
@@ -268,13 +268,13 @@ static void *test_alloc(struct kunit *test, size_t size, gfp_t gfp, enum allocat
 	 * 100x the sample interval should be more than enough to ensure we get
 	 * a KFENCE allocation eventually.
 	 */
-	timeout = jiffies + msecs_to_jiffies(100 * CONFIG_KFENCE_SAMPLE_INTERVAL);
+	timeout = jiffies + msecs_to_jiffies(100 * kfence_sample_interval);
 	/*
 	 * Especially for non-preemption kernels, ensure the allocation-gate
 	 * timer can catch up: after @resched_after, every failed allocation
 	 * attempt yields, to ensure the allocation-gate timer is scheduled.
 	 */
-	resched_after = jiffies + msecs_to_jiffies(CONFIG_KFENCE_SAMPLE_INTERVAL);
+	resched_after = jiffies + msecs_to_jiffies(kfence_sample_interval);
 	do {
 		if (test_cache)
 			alloc = kmem_cache_alloc(test_cache, gfp);
@@ -608,7 +608,7 @@ static void test_gfpzero(struct kunit *test)
 	int i;
 
 	/* Skip if we think it'd take too long. */
-	KFENCE_TEST_REQUIRES(test, CONFIG_KFENCE_SAMPLE_INTERVAL <= 100);
+	KFENCE_TEST_REQUIRES(test, kfence_sample_interval <= 100);
 
 	setup_test_cache(test, size, 0, NULL);
 	buf1 = test_alloc(test, size, GFP_KERNEL, ALLOCATE_ANY);
@@ -739,7 +739,7 @@ static void test_memcache_alloc_bulk(struct kunit *test)
 	 * 100x the sample interval should be more than enough to ensure we get
 	 * a KFENCE allocation eventually.
 	 */
-	timeout = jiffies + msecs_to_jiffies(100 * CONFIG_KFENCE_SAMPLE_INTERVAL);
+	timeout = jiffies + msecs_to_jiffies(100 * kfence_sample_interval);
 	do {
 		void *objects[100];
 		int i, num = kmem_cache_alloc_bulk(test_cache, GFP_ATOMIC, ARRAY_SIZE(objects),
-- 
2.18.0.huawei.25