vfs: simpler d_hash()

@@ -106,7 +106,7 @@ 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

@@ -3560,6 +3560,8 @@ static void __init dcache_init_early(void)
 
 	for (loop = 0; loop < (1U << d_hash_shift); loop++)
 		INIT_HLIST_BL_HEAD(dentry_hashtable + loop);
+
+	d_hash_shift = 32 - d_hash_shift;
 }
 
 static void __init dcache_init(void)

@@ -3591,6 +3593,8 @@ static void __init dcache_init(void)
 
 	for (loop = 0; loop < (1U << d_hash_shift); loop++)
 		INIT_HLIST_BL_HEAD(dentry_hashtable + loop);
+
+	d_hash_shift = 32 - d_hash_shift;
 }
 
 /* SLAB cache for __getname() consumers */