1 files changed, 6 insertions, 6 deletions

diff --git a/ipc/util.c b/ipc/util.c
index a0c139f3d1f3..4704223bfad4 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -468,9 +468,7 @@ void ipc_free(void* ptr, int size)
 struct ipc_rcu {
         struct rcu_head rcu;
         atomic_t refcount;
-        /* "void *" makes sure alignment of following data is sane. */
-        void *data[0];
-};
+} ____cacheline_aligned_in_smp;
 
 /**
  *      ipc_rcu_alloc   -       allocate ipc and rcu space 
@@ -488,12 +486,14 @@ void *ipc_rcu_alloc(int size)
         if (unlikely(!out))
                 return NULL;
         atomic_set(&out->refcount, 1);
-        return out->data;
+        return out + 1;
 }
 
 int ipc_rcu_getref(void *ptr)
 {
-        return atomic_inc_not_zero(&container_of(ptr, struct ipc_rcu, data)->refcount);
+        struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1;
+
+        return atomic_inc_not_zero(&p->refcount);
 }
 
 /**
@@ -507,7 +507,7 @@ static void ipc_schedule_free(struct rcu_head *head)
 
 void ipc_rcu_putref(void *ptr)
 {
-        struct ipc_rcu *p = container_of(ptr, struct ipc_rcu, data);
+        struct ipc_rcu *p = ((struct ipc_rcu *)ptr) - 1;
 
         if (!atomic_dec_and_test(&p->refcount))
                 return;