Messages in this thread Patch in this message | | | From | "Joel Fernandes (Google)" <> | Subject | [PATCH v4 08/14] security: Move call_rcu() to call_rcu_lazy() | Date | Fri, 19 Aug 2022 20:48:51 +0000 |
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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 --git a/security/security.c b/security/security.c index ea7163c20751..d76f4951b2bd 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); } -- 2.37.2.609.g9ff673ca1a-goog
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