diff options
| author |   Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-03-20 12:45:59 -0300 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:26:43 -0700 |
| commit | 0aec51c86986f61de26dd04913667af544a8b8eb (patch) | |
| tree | 41c39d76acc58b8cebf7e36d69b7b528bb245289 /net/dccp | |
| parent | [DCCP]: 48-bit sequence number arithmetic (diff) | |
| download | linux-dev-0aec51c86986f61de26dd04913667af544a8b8eb.tar.xz linux-dev-0aec51c86986f61de26dd04913667af544a8b8eb.zip | |
[DCCP]: Make dccp_delta_seqno return signed numbers
Problem:
Diffstat (limited to 'net/dccp')
| -rw-r--r-- | net/dccp/dccp.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index a2c20a265b25..afb313ff216e 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -113,9 +113,12 @@ static inline void dccp_inc_seqno(u64 *seqno) *seqno = ADD48(*seqno, 1); } -static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) +/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ +static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) { - return ((seqno2 << 16) - (seqno1 << 16)) >> 16; + u64 delta = SUB48(seqno2, seqno1); + + return TO_SIGNED48(delta); } /* is seq1 < seq2 ? */ |