[PATCH bpf-next] selftests/bpf: Fix test_ksyms on non-SMP kernels

[Ilya Leoshkevich <iii@linux.ibm.com>]

On non-SMP kernels __per_cpu_start is not 0, so look it up in kallsyms.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tools/testing/selftests/bpf/prog_tests/ksyms.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/ksyms.c b/tools/testing/selftests/bpf/prog_tests/ksyms.c
index e3d6777226a8..b771804b2342 100644
--- a/tools/testing/selftests/bpf/prog_tests/ksyms.c
+++ b/tools/testing/selftests/bpf/prog_tests/ksyms.c
@@ -32,6 +32,7 @@ static __u64 kallsyms_find(const char *sym)
 
 void test_ksyms(void)
 {
+	__u64 per_cpu_start_addr = kallsyms_find("__per_cpu_start");
 	__u64 link_fops_addr = kallsyms_find("bpf_link_fops");
 	const char *btf_path = "/sys/kernel/btf/vmlinux";
 	struct test_ksyms *skel;
@@ -63,8 +64,9 @@ void test_ksyms(void)
 	      "got %llu, exp %llu\n", data->out__bpf_link_fops1, (__u64)0);
 	CHECK(data->out__btf_size != btf_size, "btf_size",
 	      "got %llu, exp %llu\n", data->out__btf_size, btf_size);
-	CHECK(data->out__per_cpu_start != 0, "__per_cpu_start",
-	      "got %llu, exp %llu\n", data->out__per_cpu_start, (__u64)0);
+	CHECK(data->out__per_cpu_start != per_cpu_start_addr, "__per_cpu_start",
+	      "got %llu, exp %llu\n", data->out__per_cpu_start,
+	      per_cpu_start_addr);
 
 cleanup:
 	test_ksyms__destroy(skel);
-- 
2.25.4