dcache: subtract d_hash_shift from 32 in advance

@@ -111,7 +111,7 @@ static struct hlist_bl_head *dentry_hashtable __read_mostly;
 
 static inline struct hlist_bl_head *d_hash(unsigned int hash)
 {
-	return dentry_hashtable + (hash >> (32 - d_hash_shift));
+	return dentry_hashtable + (hash >> d_hash_shift);
 }
 
 #define IN_LOOKUP_SHIFT 10

@@ -3592,6 +3592,7 @@ static void __init dcache_init_early(void)
 					&d_hash_mask,
 					0,
 					0);
+	d_hash_shift = 32 - d_hash_shift;
 }
 
 static void __init dcache_init(void)

@@ -3618,6 +3619,7 @@ static void __init dcache_init(void)
 					&d_hash_mask,
 					0,
 					0);
+	d_hash_shift = 32 - d_hash_shift;
 }
 
 /* SLAB cache for __getname() consumers */