PERF_BUF_LEN 1237 drivers/ntb/test/ntb_perf.c buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL); PERF_BUF_LEN 1241 drivers/ntb/test/ntb_perf.c ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos);