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KEYS: Add an RCU payload dereference macro

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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>
This commit is contained in:
David Howells
2011-03-07 15:05:51 +00:00
committed by James Morris
parent 1cc26bada9
commit 633e804e89
4 changed files with 7 additions and 6 deletions
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4
include/linux/key.h
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@@ -275,6 +275,10 @@ static inline key_serial_t key_serial(struct key *key)
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