The following commit has been merged into the core/rcu branch of tip:
Commit-ID: ce4dce123fdcb5f209752d13f9f06926be65fc78
Gitweb: https://git.kernel.org/tip/ce4dce123fdcb5f209752d13f9f06926be65fc78
Author: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
AuthorDate: Mon, 25 May 2020 23:47:57 +02:00
Committer: Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 29 Jun 2020 11:59:25 -07:00
rcu: Introduce 2 arg kvfree_rcu() interface
kvmalloc() can allocate two types of objects: SLAB backed
and vmalloc backed. How it behaves depends on requested
object's size and memory pressure.
Add a kvfree_rcu() interface that can free memory allocated
via kvmalloc(). It is a simple alias to kfree_rcu() which
can now handle either type of object.
<snip>
struct test_kvfree_rcu {
struct rcu_head rcu;
unsigned char array[100];
};
struct test_kvfree_rcu *p;
p = kvmalloc(10 * PAGE_SIZE);
if (p)
kvfree_rcu(p, rcu);
<snip>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Co-developed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
include/linux/rcupdate.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index b344fc8..51b26ab 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -875,6 +875,15 @@ do { \
__kvfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \
} while (0)
+/**
+ * kvfree_rcu() - kvfree an object after a grace period.
+ * @ptr: pointer to kvfree
+ * @rhf: the name of the struct rcu_head within the type of @ptr.
+ *
+ * Same as kfree_rcu(), just simple alias.
+ */
+#define kvfree_rcu(ptr, rhf) kfree_rcu(ptr, rhf)
+
/*
* Place this after a lock-acquisition primitive to guarantee that
* an UNLOCK+LOCK pair acts as a full barrier. This guarantee applies
|