Messages in this thread Patch in this message | | | From | "Uladzislau Rezki (Sony)" <> | Subject | [PATCH v2 13/16] rcu: Introduce 2 arg kvfree_rcu() interface | Date | Mon, 25 May 2020 23:47:57 +0200 |
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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@gmail.com> Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> --- include/linux/rcupdate.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index b344fc800a9b..51b26ab02878 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 -- 2.20.1
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