1 files changed, 38 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_util.h b/tools/testing/selftests/bpf/bpf_util.h
new file mode 100644
index 000000000000..84a5d1823f02
--- /dev/null
+++ b/tools/testing/selftests/bpf/bpf_util.h
@@ -0,0 +1,38 @@
+#ifndef __BPF_UTIL__
+#define __BPF_UTIL__
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+static inline unsigned int bpf_num_possible_cpus(void)
+{
+	static const char *fcpu = "/sys/devices/system/cpu/possible";
+	unsigned int start, end, possible_cpus = 0;
+	char buff[128];
+	FILE *fp;
+
+	fp = fopen(fcpu, "r");
+	if (!fp) {
+		printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
+		exit(1);
+	}
+
+	while (fgets(buff, sizeof(buff), fp)) {
+		if (sscanf(buff, "%u-%u", &start, &end) == 2) {
+			possible_cpus = start == 0 ? end + 1 : 0;
+			break;
+		}
+	}
+
+	fclose(fp);
+	if (!possible_cpus) {
+		printf("Failed to retrieve # possible CPUs!\n");
+		exit(1);
+	}
+
+	return possible_cpus;
+}
+
+#endif /* __BPF_UTIL__ */