[NET]: IP header modifier helpers annotations.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/net/ip.h b/include/net/ip.h
index eafbcaf728fd..83cb9ac5554e 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -192,9 +192,9 @@ extern void ipfrag_init(void);
 static inline
 int ip_decrease_ttl(struct iphdr *iph)
 {
-        u32 check = iph->check;
-        check += htons(0x0100);
-        iph->check = check + (check>=0xFFFF);
+        u32 check = (__force u32)iph->check;
+        check += (__force u32)htons(0x0100);
+        iph->check = (__force __sum16)(check + (check>=0xFFFF));
         return --iph->ttl;
 }