selftests/bpf: Test timed may_goto preserves R0-R5

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Add a test that checks R0-R5 are preserved across
arch_bpf_timed_may_goto() calls.

Use bpf_get_prandom_u32() to avoid the verifier removing the checks
via DCE.

Suggested-by: Björn Töpel <bjorn@kernel.org>
Signed-off-by: Feng Jiang <jiangfeng@kylinos.cn>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20260723-riscv-bpf-timed-may-goto-v5-2-86acb54e5642@kylinos.cn
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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Feng Jiang 2026-07-23 05:41:33 +00:00 • committed by Kumar Kartikeya Dwivedi

parent 6ef8ff20c3

commit a0032241aa

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tools/testing/selftests/bpf/progs/verifier_may_goto_1.c

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