1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/bpf.h>
 3#include <bpf/bpf_helpers.h>
 4#include <bpf/bpf_tracing.h>
 5#include <stdbool.h>
 6
 7#ifdef ENABLE_ATOMICS_TESTS
 8bool skip_tests __attribute((__section__(".data"))) = false;
 9#else
10bool skip_tests = true;
11#endif
12
13SEC("fentry/bpf_fentry_test1")
14int BPF_PROG(sub, int x)
15{
16#ifdef ENABLE_ATOMICS_TESTS
17	int a = 0;
18	int b = __sync_fetch_and_add(&a, 1);
19	/* b is certainly 0 here. Can the verifier tell? */
20	while (b)
21		continue;
22#endif
23	return 0;
24}