selftests/bpf: Add tests to verify global percpu data

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If the arch, like s390x, does not support percpu insn, these cases won't
test global percpu data by checking FEAT_PERCPU_DATA support.

The following APIs have been tested for global percpu data:

1. bpf_map__set_initial_value()
2. bpf_map__initial_value()
3. bpf_map__set_value_size()
4. generated percpu struct pointer pointing to internal map's mmaped data
5. bpf_map__lookup_elem() for global percpu data map
6. bpf_map_lookup_elem_flags() for global percpu data map

At the same time, the case is also tested with 'bpftool gen skeleton -L'.

Assisted-by: Codex:gpt-5.5-xhigh
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20260813152324.97937-8-leon.hwang@linux.dev

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Leon Hwang 2026-08-13 23:23:20 +08:00 • committed by Andrii Nakryiko

parent 68d4fde73c

commit 4c9241bd73

3 changed files with 230 additions and 1 deletions

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2

tools/testing/selftests/bpf/Makefile

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188

tools/testing/selftests/bpf/prog_tests/global_data_init.c

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41

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

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