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[bpf-next,v2] selftests/bpf: Fix return value checks in perf_event_stackmap.c

Message ID 20220408041452.933944-1-ytcoode@gmail.com
State Superseded
Headers show
Series [bpf-next,v2] selftests/bpf: Fix return value checks in perf_event_stackmap.c | expand

Commit Message

Yuntao Wang April 8, 2022, 4:14 a.m. UTC 
The bpf_get_stackid() function may also return 0 on success.

Correct checks from 'val > 0' to 'val >= 0' to ensure that they cover all
possible success return values.

Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
---
v1 -> v2: update commit message

 tools/testing/selftests/bpf/progs/perf_event_stackmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/tools/testing/selftests/bpf/progs/perf_event_stackmap.c b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
index b3fcb5274ee0..f793280a3238 100644
--- a/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
+++ b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
@@ -35,10 +35,10 @@  int oncpu(void *ctx)
 	long val;
 
 	val = bpf_get_stackid(ctx, &stackmap, 0);
-	if (val > 0)
+	if (val >= 0)
 		stackid_kernel = 2;
 	val = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
-	if (val > 0)
+	if (val >= 0)
 		stackid_user = 2;
 
 	trace = bpf_map_lookup_elem(&stackdata_map, &key);