Author: glebius
Date: Fri Jan  3 12:06:54 2014
New Revision: 260225
URL: http://svnweb.freebsd.org/changeset/base/260225

Log:
  Fix circular math macro.
  
  Submitted by:         Lutz Donnerhacke via Dmitry Luhtionov
  German lesson at:     
http://lutz.donnerhacke.de/Blog/Der-Fluch-der-Stabilitaet
  PR:                   146082

Modified:
  head/sys/netgraph/ng_l2tp.c

Modified: head/sys/netgraph/ng_l2tp.c
==============================================================================
--- head/sys/netgraph/ng_l2tp.c Fri Jan  3 11:03:12 2014        (r260224)
+++ head/sys/netgraph/ng_l2tp.c Fri Jan  3 12:06:54 2014        (r260225)
@@ -98,7 +98,7 @@ static MALLOC_DEFINE(M_NETGRAPH_L2TP, "n
 #define L2TP_ENABLE_DSEQ       1                       /* enable data seq # */
 
 /* Compare sequence numbers using circular math */
-#define L2TP_SEQ_DIFF(x, y)    ((int)((int16_t)(x) - (int16_t)(y)))
+#define L2TP_SEQ_DIFF(x, y)    ((int16_t)((x) - (y)))
 
 #define SESSHASHSIZE           0x0020
 #define SESSHASH(x)            (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
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