| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include <linux/bpf.h> |
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| 3 | #include <bpf/bpf_helpers.h> |
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| 4 | #include <bpf/bpf_tracing.h> |
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| 5 | #include <stdbool.h> |
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| 6 | |
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| 7 | #ifdef ENABLE_ATOMICS_TESTS |
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| 8 | bool skip_tests __attribute((__section__(".data" ))) = false; |
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| 9 | #else |
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| 10 | bool skip_tests = true; |
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| 11 | #endif |
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| 12 | |
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| 13 | SEC("fentry/bpf_fentry_test1" ) |
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| 14 | int BPF_PROG(sub, int x) |
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| 15 | { |
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| 16 | #ifdef ENABLE_ATOMICS_TESTS |
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| 17 | int a = 0; |
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| 18 | int b = __sync_fetch_and_add(&a, 1); |
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| 19 | /* b is certainly 0 here. Can the verifier tell? */ |
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| 20 | while (b) |
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| 21 | continue; |
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| 22 | #endif |
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| 23 | return 0; |
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| 24 | } |
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| 25 | |
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