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| author | David Howells <dhowells@redhat.com> | 2011-03-07 15:05:51 +0000 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2011-03-08 11:17:11 +1100 |
| commit | 633e804e89464d3875e59de1959a53f9041d3094 (patch) | |
| tree | 0a2464267c5f7a4e8166771fdc88e181a5b6219a /include/linux/key.h | |
| parent | 1cc26bada9f6807814806db2f0d78792eecdac71 (diff) | |
| download | linux-3.10-633e804e89464d3875e59de1959a53f9041d3094.tar.gz linux-3.10-633e804e89464d3875e59de1959a53f9041d3094.tar.bz2 linux-3.10-633e804e89464d3875e59de1959a53f9041d3094.zip | |
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>
Diffstat (limited to 'include/linux/key.h')
| -rw-r--r-- | include/linux/key.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/key.h b/include/linux/key.h index 3db0adce1fd..a6b1edcffc3 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -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 |