diff mbox series

[v3,3/3] mm: slub: test: Use the kunit_get_current_test() function

Message ID 20221119081252.3864249-3-davidgow@google.com
State Accepted
Commit 909c6475d568826be377893cf5abb7cde5877230
Headers show
Series [v3,1/3] kunit: Provide a static key to check if KUnit is actively running tests | expand

Commit Message

David Gow Nov. 19, 2022, 8:12 a.m. UTC 
Use the newly-added function kunit_get_current_test() instead of
accessing current->kunit_test directly. This function uses a static key
to return more quickly when KUnit is enabled, but no tests are actively
running. There should therefore be a negligible performance impact to
enabling the slub KUnit tests.

Other than the performance improvement, this should be a no-op.

Cc: Oliver Glitta <glittao@gmail.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---

This is intended as an example use of the new function. Other users
(such as KASAN) will be updated separately, as there would otherwise be
conflicts.

We'll take this whole series via the kselftest/kunit tree.

Changes since v2:
https://lore.kernel.org/all/20221025071907.1251820-3-davidgow@google.com/
- Get rid of a redundant 'likely' (Thanks Vlastimil Babka)
- Use current->kunit_test directly when we already know a test is
  running. (Thanks Vlastimil Babka)
- Add Vlastimil's Acked-by.

There was no v1 of this patch. v1 of the series can be found here:
https://lore.kernel.org/linux-kselftest/20221021072854.333010-1-davidgow@google.com/T/#u

Cheers,
-- David

---
 lib/slub_kunit.c | 1 +
 mm/slub.c        | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/lib/slub_kunit.c b/lib/slub_kunit.c
index 7a0564d7cb7a..8fd19c8301ad 100644
--- a/lib/slub_kunit.c
+++ b/lib/slub_kunit.c
@@ -1,5 +1,6 @@ 
 // SPDX-License-Identifier: GPL-2.0
 #include <kunit/test.h>
+#include <kunit/test-bug.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/module.h>
diff --git a/mm/slub.c b/mm/slub.c
index 157527d7101b..1887996cb703 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -39,6 +39,7 @@ 
 #include <linux/memcontrol.h>
 #include <linux/random.h>
 #include <kunit/test.h>
+#include <kunit/test-bug.h>
 #include <linux/sort.h>
 
 #include <linux/debugfs.h>
@@ -603,7 +604,7 @@  static bool slab_add_kunit_errors(void)
 {
 	struct kunit_resource *resource;
 
-	if (likely(!current->kunit_test))
+	if (!kunit_get_current_test())
 		return false;
 
 	resource = kunit_find_named_resource(current->kunit_test, "slab_errors");