selftests/bpf: Improve test coverage for kfunc call

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On powerpc, immediate load instructions are sign extended. In case
of unsigned types, arguments should be explicitly zero-extended by
the caller. For kfunc call, this needs to be handled in the JIT code.
In bpf_kfunc_call_test4(), that tests for sign-extension of signed
argument types in kfunc calls, add some additional failure checks.
And add bpf_kfunc_call_test5() to test zero-extension of unsigned
argument types in kfunc calls.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260312080113.843408-1-hbathini@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Hari Bathini 2026-03-12 13:31:13 +05:30 • committed by Alexei Starovoitov

parent ca0f39a369

commit 2af3aa702c

4 changed files with 154 additions and 1 deletions

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2

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

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98

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

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tools/testing/selftests/bpf/test_kmods/bpf_testmod.c

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tools/testing/selftests/bpf/test_kmods/bpf_testmod_kfunc.h

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