The SLAB_TYPESAFE_BY_RCU example code snippet uses a single RCU
read-side critical section for retries.
'Documentation/RCU/rculist_nulls.rst' has similar example code snippet,
and commit da82af04352b ("doc: Update and wordsmith rculist_nulls.rst")
has broken it up. Apply the change to SLAB_TYPESAFE_BY_RCU example code
snippet, too.
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
include/linux/slab.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index b18e56c6f06c..6acf1b7c6551 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -53,16 +53,18 @@
* stays valid, the trick to using this is relying on an independent
* object validation pass. Something like:
*
+ * begin:
* rcu_read_lock();
- * again:
* obj = lockless_lookup(key);
* if (obj) {
* if (!try_get_ref(obj)) // might fail for free objects
- * goto again;
+ * rcu_read_unlock();
+ * goto begin;
*
* if (obj->key != key) { // not the object we expected
* put_ref(obj);
- * goto again;
+ * rcu_read_unlock();
+ * goto begin;
* }
* }
* rcu_read_unlock();
--
2.25.1
