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kfence: make test case compatible with run time set sample interval

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The parameter kfence_sample_interval can be set via boot parameter and
late shell command, which is convenient for automated tests and KFENCE
parameter optimization.  However, KFENCE test case just uses
compile-time CONFIG_KFENCE_SAMPLE_INTERVAL, which will make KFENCE test
case not run as users desired.  Export kfence_sample_interval, so that
KFENCE test case can use run-time-set sample interval.

Link: https://lkml.kernel.org/r/20220207034432.185532-1-liupeng256@huawei.com
Signed-off-by: Peng Liu <liupeng256@huawei.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Christian Knig <christian.koenig@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Peng Liu 2022-02-11 16:32:35 -08:00 committed by Linus Torvalds
parent 0764db9b49
commit 8913c61001
3 changed files with 8 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/kfence.h
View file

@ -17,6 +17,8 @@
#include <linux/atomic.h>
#include <linux/static_key.h>
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

3
mm/kfence/core.c
View file

@ -47,7 +47,8 @@
static 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_GPL(kfence_sample_interval); /* Export for test modules. */
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX

8
mm/kfence/kfence_test.c
View file

@ -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),