From: Yonghong Song <yhs@fb.com>
Date: Wed, 13 May 2020 22:32:07 -0700
Subject: selftests/bpf: Enforce returning 0 for fentry/fexit programs
Patch-mainline: v5.7-rc6
Git-commit: 6d74f64b922b8394dccc52576659cb0dc0a1da7b
References: bsc#1177028

There are a few fentry/fexit programs returning non-0.
The tests with these programs will break with the previous
patch which enfoced return-0 rules. Fix them properly.

Fixes: ac065870d928 ("selftests/bpf: Add BPF_PROG, BPF_KPROBE, and BPF_KRETPROBE macros")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200514053207.1298479-1-yhs@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
 tools/testing/selftests/bpf/progs/test_overhead.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/bpf/progs/test_overhead.c
+++ b/tools/testing/selftests/bpf/progs/test_overhead.c
@@ -31,13 +31,13 @@ int prog3(struct bpf_raw_tracepoint_args
 SEC("fentry/__set_task_comm")
 int BPF_PROG(prog4, struct task_struct *tsk, const char *buf, bool exec)
 {
-	return !tsk;
+	return 0;
 }
 
 SEC("fexit/__set_task_comm")
 int BPF_PROG(prog5, struct task_struct *tsk, const char *buf, bool exec)
 {
-	return !tsk;
+	return 0;
 }
 
 char _license[] SEC("license") = "GPL";