(list).next_offset = silc_offsetof(type, nextfield); \
(list).prev_offset = silc_offsetof(type, prevfield); \
(list).prev_set = 1; \
(list).next_offset = silc_offsetof(type, nextfield); \
(list).prev_offset = silc_offsetof(type, prevfield); \
(list).prev_set = 1; \