From ce4dce123fdcb5f209752d13f9f06926be65fc78 Mon Sep 17 00:00:00 2001 From: "Uladzislau Rezki (Sony)" Date: Mon, 25 May 2020 23:47:57 +0200 Subject: [PATCH] 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. 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); Signed-off-by: Uladzislau Rezki (Sony) Co-developed-by: Joel Fernandes (Google) Reviewed-by: Joel Fernandes (Google) Signed-off-by: Joel Fernandes (Google) Signed-off-by: Paul E. McKenney --- 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