Not sure if this is a worthwhile optimization? FreeBSD 7.0
--- /usr/src/sys/net/if_var.h 2007-12-07 09:46:08.000000000 +0400
+++ if_var.h 2008-05-30 18:10:25.000000000 +0500
@@ -282,7 +282,8 @@
if (m) { \
if (((ifq)->ifq_head = (m)->m_nextpkt) == NULL) \
(ifq)->ifq_tail = NULL; \
- (m)->m_nextpkt = NULL; \
+ else \
+ (m)->m_nextpkt = NULL; \
(ifq)->ifq_len--; \
} \
} while (0)
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