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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>
This commit is contained in:
Davidlohr Bueso 2013-07-08 16:01:10 -07:00 committed by Linus Torvalds
parent dbfcd91f06
commit 1ca7003ab4
1 changed files with 15 additions and 5 deletions
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20
ipc/util.h
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@ -159,6 +159,21 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
return uid / SEQ_MULTIPLIER != ipcp->seq; return uid / SEQ_MULTIPLIER != ipcp->seq;
} }
static inline void ipc_lock_object(struct kern_ipc_perm *perm)
{
spin_lock(&perm->lock);
}
static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
{
spin_unlock(&perm->lock);
}
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) static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
{ {
rcu_read_lock(); rcu_read_lock();
@ -171,11 +186,6 @@ static inline void ipc_unlock(struct kern_ipc_perm *perm)
rcu_read_unlock(); rcu_read_unlock();
} }
static inline void ipc_lock_object(struct kern_ipc_perm *perm)
{
spin_lock(&perm->lock);
}
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id); 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); struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,