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diff --git a/sys/sys/queue.h b/sys/sys/queue.h
--- a/sys/sys/queue.h
+++ b/sys/sys/queue.h
@@ -564,6 +564,20 @@
(head2)->stqh_last = &STAILQ_FIRST(head2); \
} while (0)
+#define STAILQ_REVERSE(head, type, field) do { \
+ QUEUE_TYPEOF(type) *_Var, *_Varp, *_Varn; \
+ for (_Var = STAILQ_FIRST(head), _Varp = NULL; \
+ _Var != NULL;) { \
+ _Varn = STAILQ_NEXT(_Var, field); \
+ STAILQ_NEXT(_Var, field) = _Varp; \
+ _Varp = _Var; \
+ _Var = _Varn; \
+ } \
+ _Var = STAILQ_LAST(head, type, field); \
+ (head)->stqh_last = &STAILQ_FIRST(head); \
+ (head)->stqh_first = _Var; \
+} while (0)
+
#define STAILQ_END(head) NULL

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