audit: use atomic_t to simplify audit_serial()
Since there is already a primitive to do this operation in the atomic_t, use it
to simplify audit_serial().
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
diff --git a/kernel/audit.c b/kernel/audit.c
index 8a82d48..7aef7cb 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1301,19 +1301,9 @@
*/
unsigned int audit_serial(void)
{
- static DEFINE_SPINLOCK(serial_lock);
- static unsigned int serial = 0;
+ static atomic_t serial = ATOMIC_INIT(0);
- unsigned long flags;
- unsigned int ret;
-
- spin_lock_irqsave(&serial_lock, flags);
- do {
- ret = ++serial;
- } while (unlikely(!ret));
- spin_unlock_irqrestore(&serial_lock, flags);
-
- return ret;
+ return atomic_add_return(1, &serial);
}
static inline void audit_get_stamp(struct audit_context *ctx,