diff mbox series

[v5,13/18] security: Move call_rcu() to call_rcu_lazy()

Message ID 20220901221720.1105021-14-joel@joelfernandes.org (mailing list archive)
State New, archived
Headers show
Series Implement call_rcu_lazy() and miscellaneous fixes | expand

Commit Message

Joel Fernandes Sept. 1, 2022, 10:17 p.m. UTC 
This is required to prevent callbacks triggering RCU machinery too
quickly and too often, which adds more power to the system.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
 security/security.c    | 2 +-
 security/selinux/avc.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/security/security.c b/security/security.c
index 14d30fec8a00..b51b4bdb567d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1053,7 +1053,7 @@  void security_inode_free(struct inode *inode)
 	 * The inode will be freed after the RCU grace period too.
 	 */
 	if (inode->i_security)
-		call_rcu((struct rcu_head *)inode->i_security,
+		call_rcu_lazy((struct rcu_head *)inode->i_security,
 				inode_free_by_rcu);
 }
 
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 9a43af0ebd7d..381f046d820f 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -442,7 +442,7 @@  static void avc_node_free(struct rcu_head *rhead)
 static void avc_node_delete(struct selinux_avc *avc, struct avc_node *node)
 {
 	hlist_del_rcu(&node->list);
-	call_rcu(&node->rhead, avc_node_free);
+	call_rcu_lazy(&node->rhead, avc_node_free);
 	atomic_dec(&avc->avc_cache.active_nodes);
 }
 
@@ -458,7 +458,7 @@  static void avc_node_replace(struct selinux_avc *avc,
 			     struct avc_node *new, struct avc_node *old)
 {
 	hlist_replace_rcu(&old->list, &new->list);
-	call_rcu(&old->rhead, avc_node_free);
+	call_rcu_lazy(&old->rhead, avc_node_free);
 	atomic_dec(&avc->avc_cache.active_nodes);
 }