[DCCP]: 48-bit sequence number arithmetic

This patch
 * organizes the sequence arithmetic functions into one corner of dccp.h
 * performs a small modification of dccp_set_seqno to make it more widely reusable
   (now it is safe to use any number, since it performs modulo-2^48 assignment)
 * adds functions and generic macros for 48-bit sequence arithmetic:
 	--48 bit complement
 	--modulo-48 addition and modulo-48 subtraction
	--dccp_inc_seqno now a special case of add48
Constants renamed following a suggestion by Arnaldo.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index a086c6312d3b..01030f346177 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -157,7 +157,7 @@ struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
 
         if (av != NULL) {
                 av->dccpav_buf_head     = DCCP_MAX_ACKVEC_LEN - 1;
-                av->dccpav_buf_ackno    = DCCP_MAX_SEQNO + 1;
+                av->dccpav_buf_ackno    = UINT48_MAX + 1;
                 av->dccpav_buf_nonce = av->dccpav_buf_nonce = 0;
                 av->dccpav_time.tv_sec  = 0;
                 av->dccpav_time.tv_usec = 0;