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| author | Davidlohr Bueso <davidlohr.bueso@hp.com> | 2013-07-08 16:01:10 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-09 10:33:27 -0700 |
| commit | 1ca7003ab41152d673d9e359632283d05294f3d6 (patch) | |
| tree | b587df3d3a2aecc47acd74712348c2895c292bb6 /ipc | |
| parent | dbfcd91f06f0e2d5564b2fd184e9c2a43675f9ab (diff) | |
| download | lwn-1ca7003ab41152d673d9e359632283d05294f3d6.tar.gz lwn-1ca7003ab41152d673d9e359632283d05294f3d6.zip | |
ipc: introduce ipc object locking helpers
Simple helpers around the (kern_ipc_perm *)->lock spinlock.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/util.h | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/ipc/util.h b/ipc/util.h index 2b0bdd5d92ce..da65e8afb8f4 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -159,23 +159,33 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) return uid / SEQ_MULTIPLIER != ipcp->seq; } -static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) +static inline void ipc_lock_object(struct kern_ipc_perm *perm) { - rcu_read_lock(); spin_lock(&perm->lock); } -static inline void ipc_unlock(struct kern_ipc_perm *perm) +static inline void ipc_unlock_object(struct kern_ipc_perm *perm) { spin_unlock(&perm->lock); - rcu_read_unlock(); } -static inline void ipc_lock_object(struct kern_ipc_perm *perm) +static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm) { + assert_spin_locked(&perm->lock); +} + +static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) +{ + rcu_read_lock(); spin_lock(&perm->lock); } +static inline void ipc_unlock(struct kern_ipc_perm *perm) +{ + spin_unlock(&perm->lock); + rcu_read_unlock(); +} + struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id); struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id); int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, |