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Commit 56a268cd authored by Thomas Meyer's avatar Thomas Meyer Committed by Shuah Khan
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selftests/bpf: Make bpf_util work on uniprocessor systems 



The current implementation fails to work on uniprocessor systems.
Fix the parser to also handle the uniprocessor case.

Signed-off-by: default avatarThomas Meyer <thomas@m3y3r.de>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
parent 6f000336

tools/testing/selftests/bpf/bpf_util.h

+9 −8
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ static inline unsigned int bpf_num_possible_cpus(void) 
	unsigned int start, end, possible_cpus = 0;

	char buff[128];

	FILE *fp;

	int n;



	fp = fopen(fcpu, "r");

	if (!fp) {
@@ -20,17 +21,17 @@ static inline unsigned int bpf_num_possible_cpus(void) 
	}



	while (fgets(buff, sizeof(buff), fp)) {

		if (sscanf(buff, "%u-%u", &start, &end) == 2) {

		n = sscanf(buff, "%u-%u", &start, &end);

		if (n == 0) {

			printf("Failed to retrieve # possible CPUs!\n");

			exit(1);

		} else if (n == 1) {

			end = start;

		}

		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;

}