datapath: use const in some local vars and casts

In few functions, const formal parameters are assigned or cast to
non-const.
These changes suppress warnings if compiled with -Wcast-qual.

Signed-off-by: Daniele Di Proietto <daniele.di.proietto@gmail.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/datapath/flow_netlink.c b/datapath/flow_netlink.c
index 9b26528..3106fc9 100644 (file)
--- a/datapath/flow_netlink.c
+++ b/datapath/flow_netlink.c
@@ -628,8 +628,10 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match,  bool *exact_5tuple
 
                if (is_mask && exact_5tuple && *exact_5tuple) {
                        if (ipv6_key->ipv6_proto != 0xff ||
-                           !is_all_set((u8 *)ipv6_key->ipv6_src, sizeof(match->key->ipv6.addr.src)) ||
-                           !is_all_set((u8 *)ipv6_key->ipv6_dst, sizeof(match->key->ipv6.addr.dst)))
+                           !is_all_set((const u8 *)ipv6_key->ipv6_src,
+                                       sizeof(match->key->ipv6.addr.src)) ||
+                           !is_all_set((const u8 *)ipv6_key->ipv6_dst,
+                                       sizeof(match->key->ipv6.addr.dst)))
                                *exact_5tuple = false;
                }
        }

diff --git a/datapath/flow_table.c b/datapath/flow_table.c
index 2e8557c..c0ba8ef 100644 (file)
--- a/datapath/flow_table.c
+++ b/datapath/flow_table.c
@@ -59,8 +59,10 @@ static u16 range_n_bytes(const struct sw_flow_key_range *range)
 void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
                       const struct sw_flow_mask *mask)
 {
-       const long *m = (long *)((u8 *)&mask->key + mask->range.start);
-       const long *s = (long *)((u8 *)src + mask->range.start);
+       const long *m = (const long *)((const u8 *)&mask->key +
+                               mask->range.start);
+       const long *s = (const long *)((const u8 *)src +
+                               mask->range.start);
        long *d = (long *)((u8 *)dst + mask->range.start);
        int i;
 
@@ -382,7 +384,7 @@ int ovs_flow_tbl_flush(struct flow_table *flow_table)
 static u32 flow_hash(const struct sw_flow_key *key, int key_start,
                     int key_end)
 {
-       u32 *hash_key = (u32 *)((u8 *)key + key_start);
+       const u32 *hash_key = (const u32 *)((const u8 *)key + key_start);
        int hash_u32s = (key_end - key_start) >> 2;
 
        /* Make sure number of hash bytes are multiple of u32. */
@@ -404,8 +406,8 @@ static bool cmp_key(const struct sw_flow_key *key1,
                    const struct sw_flow_key *key2,
                    int key_start, int key_end)
 {
-       const long *cp1 = (long *)((u8 *)key1 + key_start);
-       const long *cp2 = (long *)((u8 *)key2 + key_start);
+       const long *cp1 = (const long *)((const u8 *)key1 + key_start);
+       const long *cp2 = (const long *)((const u8 *)key2 + key_start);
        long diffs = 0;
        int i;
 
@@ -520,8 +522,8 @@ static struct sw_flow_mask *mask_alloc(void)
 static bool mask_equal(const struct sw_flow_mask *a,
                       const struct sw_flow_mask *b)
 {
-       u8 *a_ = (u8 *)&a->key + a->range.start;
-       u8 *b_ = (u8 *)&b->key + b->range.start;
+       const u8 *a_ = (const u8 *)&a->key + a->range.start;
+       const u8 *b_ = (const u8 *)&b->key + b->range.start;
 
        return  (a->range.end == b->range.end)
                && (a->range.start == b->range.start)