rculfhash: introduce REMOVED_FLAG and FLAG_MASK

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/rculfhash.c b/rculfhash.c
index 3120d4585995c030a999903b0667d803ebf5b877..2ec91f2f51b6ffd37a7d295a66f52c99ade80791 100644 (file)
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -53,6 +53,9 @@
 #define max(a, b)      ((a) > (b) ? (a) : (b))
 #endif
 
+#define REMOVED_FLAG           (1UL << 0)
+#define FLAGS_MASK             ((1UL << 1) - 1)
+
 struct rcu_table {
        unsigned long size;     /* always a power of 2 */
        unsigned long resize_target;
@@ -176,19 +179,19 @@ void check_resize(struct rcu_ht *ht, struct rcu_table *t,
 static
 struct rcu_ht_node *clear_flag(struct rcu_ht_node *node)
 {
-       return (struct rcu_ht_node *) (((unsigned long) node) & ~0x1);
+       return (struct rcu_ht_node *) (((unsigned long) node) & ~FLAGS_MASK);
 }
 
 static
 int is_removed(struct rcu_ht_node *node)
 {
-       return ((unsigned long) node) & 0x1;
+       return ((unsigned long) node) & REMOVED_FLAG;
 }
 
 static
 struct rcu_ht_node *flag_removed(struct rcu_ht_node *node)
 {
-       return (struct rcu_ht_node *) (((unsigned long) node) | 0x1);
+       return (struct rcu_ht_node *) (((unsigned long) node) | REMOVED_FLAG);
 }
 
 static