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authorDavidlohr Bueso <davidlohr.bueso@hp.com>2013-07-08 16:01:10 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-10-18 07:45:46 -0700
commit9f7b399c9dbc71bd09d5b45242a6fb8fbf2650a3 (patch)
tree6999d3234f36342352b2aa4911593b51b439d76f /ipc
parent34b2092419a3f73bb69c55247fe71ca4941faad2 (diff)
downloadlinaro-lsk-9f7b399c9dbc71bd09d5b45242a6fb8fbf2650a3.tar.gz
ipc: introduce ipc object locking helpers
commit 1ca7003ab41152d673d9e359632283d05294f3d6 upstream. 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> Cc: Mike Galbraith <efault@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/util.h20
1 files changed, 15 insertions, 5 deletions
diff --git a/ipc/util.h b/ipc/util.h
index 2b0bdd5d92c..da65e8afb8f 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,