TRACE_BUF_SIZE
#define PERF_TRACE_MAX_ENTRY ((TRACE_BUF_SIZE - 8)/sizeof(struct dmcub_trace_buf_entry))
char buffer[4][TRACE_BUF_SIZE];
len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args);
if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0)
len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args);