diff --git a/ipc/shm.c b/ipc/shm.c
index f806a2e3..6b0c9af 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -91,8 +91,8 @@
 static inline void shm_inc (int id) {
 	struct shmid_kernel *shp;
 
-	if(!(shp = shm_lock(id)))
-		BUG();
+	shp = shm_lock(id);
+	BUG_ON(!shp);
 	shp->shm_atim = get_seconds();
 	shp->shm_lprid = current->tgid;
 	shp->shm_nattch++;
@@ -142,8 +142,8 @@
 
 	mutex_lock(&shm_ids.mutex);
 	/* remove from the list of attaches of the shm segment */
-	if(!(shp = shm_lock(id)))
-		BUG();
+	shp = shm_lock(id);
+	BUG_ON(!shp);
 	shp->shm_lprid = current->tgid;
 	shp->shm_dtim = get_seconds();
 	shp->shm_nattch--;
@@ -283,8 +283,7 @@
 		err = -EEXIST;
 	} else {
 		shp = shm_lock(id);
-		if(shp==NULL)
-			BUG();
+		BUG_ON(shp==NULL);
 		if (shp->shm_segsz < size)
 			err = -EINVAL;
 		else if (ipcperms(&shp->shm_perm, shmflg))
@@ -774,8 +773,8 @@
 	up_write(&current->mm->mmap_sem);
 
 	mutex_lock(&shm_ids.mutex);
-	if(!(shp = shm_lock(shmid)))
-		BUG();
+	shp = shm_lock(shmid);
+	BUG_ON(!shp);
 	shp->shm_nattch--;
 	if(shp->shm_nattch == 0 &&
 	   shp->shm_perm.mode & SHM_DEST)