msu_trc_t
msu_trc_t *oplmsu_ltrc_top; /* Top of trace data area */
msu_trc_t *oplmsu_ltrc_tail; /* Tail of trace data area */
msu_trc_t *oplmsu_ltrc_cur; /* Current pointer of trace data area */
oplmsu_ltrc_top = (msu_trc_t *)kmem_zalloc(
(sizeof (msu_trc_t) * oplmsu_ltrc_size), KM_SLEEP);
oplmsu_ltrc_cur = (msu_trc_t *)(oplmsu_ltrc_top - 1);
(msu_trc_t *)(oplmsu_ltrc_top + (oplmsu_ltrc_size - 1));
(sizeof (msu_trc_t) * oplmsu_ltrc_size));
extern msu_trc_t *oplmsu_ltrc_top;
extern msu_trc_t *oplmsu_ltrc_tail;
extern msu_trc_t *oplmsu_ltrc_cur;