3 Commits

Author	SHA1	Message	Date
Puranjay Mohan	157317ba66	selftests/bpf: Use at least 10 args in stack argument tests ... On arm64, the first 8 arguments are passed in registers (x0-x7), so tests with 8 or fewer arguments never exercise the native stack argument path in the JIT. Increase argument counts to at least 10 across all BPF-to-BPF subprog and kfunc stack argument tests so that at least 2 arguments land on the arm64 stack. For the two-callees test, bump foo1 from 8 to 10 and foo2 from 10 to 12 args to preserve the different-stack-depth flavor of the test. The bpf_kfunc_call_stack_arg_mem kfunc is left unchanged at 7 args to avoid breaking the precision backtracking test which relies on hardcoded verifier log instruction indices. Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260528161750.1900674-3-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>	2026-05-31 17:49:21 -07:00
Puranjay Mohan	90e43f1b47	selftests/bpf: Enable stack argument tests for arm64 ... Now that arm64 supports stack arguments, enable the existing stack_arg, stack_arg_kfunc and verifier_stack_arg tests for __TARGET_ARCH_arm64. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260513045204.2403441-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>	2026-05-13 09:27:32 -07:00
Yonghong Song	79e7ec0063	selftests/bpf: Add tests for BPF function stack arguments ... Add selftests covering stack argument passing for both BPF-to-BPF subprog calls and kfunc calls with more than 5 arguments. All tests are guarded by __BPF_FEATURE_STACK_ARGUMENT and __TARGET_ARCH_x86. BPF-to-BPF subprog call tests (stack_arg.c): - Scalar stack args - Pointer stack args - Mixed pointer/scalar stack args - Nested calls - Dynptr stack arg - Two callees with different stack arg counts - Async callback Kfunc call tests (stack_arg_kfunc.c, with bpf_testmod kfuncs): - Scalar stack args - Pointer stack args - Mixed pointer/scalar stack args - Dynptr stack arg - Memory buffer + size pair - Iterator - Const string pointer - Timer pointer Acked-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260513045127.2397187-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>	2026-05-13 09:27:32 -07:00