KEYS: Add an RCU payload dereference macro
Add an RCU payload dereference macro as this seems to be a common piece of code
amongst key types that use RCU referenced payloads.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/include/linux/key.h b/include/linux/key.h
index 3db0adc..a6b1edc 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -275,6 +275,10 @@
return key ? key->serial : 0;
}
+#define rcu_dereference_key(KEY) \
+ (rcu_dereference_protected((KEY)->payload.rcudata, \
+ rwsem_is_locked(&((struct key *)(KEY))->sem)))
+
#ifdef CONFIG_SYSCTL
extern ctl_table key_sysctls[];
#endif