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X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA3MDE3NCBTYWx0ZWRfX2MJ/f94oQgFs TnDc1kVlvmRq2znIU0Jb5fZEkdZb0GeKoE4az19veXXd4I6kXua26148+yjsZymInnTeWmFe136 ys+3yMUolqkL8bSEHRj0KfUAc2bhjvtmhBWn/uMPssxl3PoSrq2U On 07/09/2026 14:10, Mingpei CAO wrote: > Exercise recursive array comparison with different and identical > element definitions. Check that distinct containers remain separate > and identical types are deduplicated, including their references. > > The negative case fails before the fix and passes afterwards. > The positive case passes both before and after the fix. > > Assisted-by: LLM > Signed-off-by: Mingpei CAO this test would be better placed in prog_tests/btf.c I think where there are a number of other BTF dedup tests; something like the following is roughly equivalent to what you have: diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c index 67b9015cbd98..1c4a46e2a64d 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf.c +++ b/tools/testing/selftests/bpf/prog_tests/btf.c @@ -7062,6 +7062,94 @@ static struct btf_dedup_test dedup_tests[] = { BTF_STR_SEC("\0int\0long int"), }, }, +{ + .descr = "dedup: array element comparison", + .input = { + .raw_types = { + /* signed int */ + BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + /* unsigned int */ + BTF_TYPE_INT_ENC(NAME_NTH(2), 0, 0, 32, 4), /* [2] */ + /* signed int[1] */ + BTF_TYPE_ARRAY_ENC(1, 1, 1), /* [3] */ + /* duplicate signed int[1] */ + BTF_TYPE_ARRAY_ENC(1, 1, 1), /* [4] */ + /* unsigned int[1] */ + BTF_TYPE_ARRAY_ENC(2, 2, 1), /* [5] */ + /* struct s { signed int a[1]; signed int b[1]; } */ + BTF_STRUCT_ENC(NAME_NTH(3), 2, 8), /* [6] */ + BTF_MEMBER_ENC(NAME_NTH(4), 3, 0), + BTF_MEMBER_ENC(NAME_NTH(5), 3, 32), + /* struct s { signed int a[1]; unsigned int b[1]; } */ + BTF_STRUCT_ENC(NAME_NTH(3), 2, 8), /* [7] */ + BTF_MEMBER_ENC(NAME_NTH(4), 4, 0), + BTF_MEMBER_ENC(NAME_NTH(5), 5, 32), + BTF_END_RAW, + }, + BTF_STR_SEC("\0int\0unsigned int\0s\0a\0b"), + }, + .expect = { + .raw_types = { + BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + BTF_TYPE_INT_ENC(NAME_NTH(2), 0, 0, 32, 4), /* [2] */ + BTF_TYPE_ARRAY_ENC(1, 1, 1), /* [3] */ + BTF_TYPE_ARRAY_ENC(2, 2, 1), /* [4] */ + BTF_STRUCT_ENC(NAME_NTH(3), 2, 8), /* [5] */ + BTF_MEMBER_ENC(NAME_NTH(4), 3, 0), + BTF_MEMBER_ENC(NAME_NTH(5), 3, 32), + BTF_STRUCT_ENC(NAME_NTH(3), 2, 8), /* [6] */ + BTF_MEMBER_ENC(NAME_NTH(4), 3, 0), + BTF_MEMBER_ENC(NAME_NTH(5), 4, 32), + BTF_END_RAW, + }, + BTF_STR_SEC("\0int\0unsigned int\0s\0a\0b"), + }, +}, +{ + .descr = "dedup: identical array element comparison", + .input = { + .raw_types = { + /* int */ + BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + /* struct container { struct elem first[1]; struct elem second[1]; } */ + BTF_STRUCT_ENC(NAME_NTH(2), 2, 8), /* [2] */ + BTF_MEMBER_ENC(NAME_NTH(3), 3, 0), + BTF_MEMBER_ENC(NAME_NTH(4), 3, 32), + /* struct elem[1] */ + BTF_TYPE_ARRAY_ENC(4, 1, 1), /* [3] */ + /* struct elem { int x; } */ + BTF_STRUCT_ENC(NAME_NTH(5), 1, 4), /* [4] */ + BTF_MEMBER_ENC(NAME_NTH(6), 1, 0), + /* duplicate struct container */ + BTF_STRUCT_ENC(NAME_NTH(2), 2, 8), /* [5] */ + BTF_MEMBER_ENC(NAME_NTH(3), 6, 0), + BTF_MEMBER_ENC(NAME_NTH(4), 7, 32), + /* duplicate struct elem[1] */ + BTF_TYPE_ARRAY_ENC(8, 1, 1), /* [6] */ + BTF_TYPE_ARRAY_ENC(9, 1, 1), /* [7] */ + /* duplicate struct elem */ + BTF_STRUCT_ENC(NAME_NTH(5), 1, 4), /* [8] */ + BTF_MEMBER_ENC(NAME_NTH(6), 1, 0), + BTF_STRUCT_ENC(NAME_NTH(5), 1, 4), /* [9] */ + BTF_MEMBER_ENC(NAME_NTH(6), 1, 0), + BTF_END_RAW, + }, + BTF_STR_SEC("\0int\0container\0first\0second\0elem\0x"), + }, + .expect = { + .raw_types = { + BTF_TYPE_INT_ENC(NAME_NTH(1), BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + BTF_STRUCT_ENC(NAME_NTH(2), 2, 8), /* [2] */ + BTF_MEMBER_ENC(NAME_NTH(3), 3, 0), + BTF_MEMBER_ENC(NAME_NTH(4), 3, 32), + BTF_TYPE_ARRAY_ENC(4, 1, 1), /* [3] */ + BTF_STRUCT_ENC(NAME_NTH(5), 1, 4), /* [4] */ + BTF_MEMBER_ENC(NAME_NTH(6), 1, 0), + BTF_END_RAW, + }, + BTF_STR_SEC("\0int\0container\0first\0second\0elem\0x"), + }, +}, { .descr = "dedup: struct example #1", /* > --- > .../selftests/bpf/prog_tests/btf_dedup.c | 68 +++++++++++++++++++ > 1 file changed, 68 insertions(+) > create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_dedup.c > > diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dedup.c b/tools/testing/selftests/bpf/prog_tests/btf_dedup.c > new file mode 100644 > index 000000000000..3e889c0bed53 > --- /dev/null > +++ b/tools/testing/selftests/bpf/prog_tests/btf_dedup.c > @@ -0,0 +1,68 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#include > +#include > +#include "btf_helpers.h" > + > +static void test_array_element_types(bool identical) > +{ > + struct btf *btf; > + > + btf = btf__new_empty(); > + if (!ASSERT_OK_PTR(btf, "btf_new")) > + return; > + > + /* > + * Comparing the first fields maps array [3] to [6]. The second > + * fields reuse [3], requiring an identical-type check of [6]/[7]. > + * Place container [5] before its elements [8]/[9] so they still > + * have distinct IDs when their definitions are compared. > + */ > + if (!ASSERT_EQ(btf__add_int(btf, "int", 4, BTF_INT_SIGNED), 1, "int") || > + !ASSERT_EQ(btf__add_struct(btf, "container", 8), 2, "container1") || > + !ASSERT_OK(btf__add_field(btf, "first", 3, 0, 0), "first1") || > + !ASSERT_OK(btf__add_field(btf, "second", 3, 32, 0), "second1") || > + !ASSERT_EQ(btf__add_array(btf, 1, 4, 1), 3, "array1") || > + !ASSERT_EQ(btf__add_struct(btf, "elem", 4), 4, "elem1") || > + !ASSERT_OK(btf__add_field(btf, "x", 1, 0, 0), "elem1_field") || > + !ASSERT_EQ(btf__add_struct(btf, "container", 8), 5, "container2") || > + !ASSERT_OK(btf__add_field(btf, "first", 6, 0, 0), "first2") || > + !ASSERT_OK(btf__add_field(btf, "second", 7, 32, 0), "second2") || > + !ASSERT_EQ(btf__add_array(btf, 1, 8, 1), 6, "array2") || > + !ASSERT_EQ(btf__add_array(btf, 1, 9, 1), 7, "array3") || > + !ASSERT_EQ(btf__add_struct(btf, "elem", 4), 8, "elem2") || > + !ASSERT_OK(btf__add_field(btf, "x", 1, 0, 0), "elem2_field") || > + !ASSERT_EQ(btf__add_struct(btf, "elem", 4), 9, "elem3") || > + !ASSERT_OK(btf__add_field(btf, identical ? "x" : "y", 1, 0, 0), "elem3_field")) > + goto out; > + > + if (!ASSERT_OK(btf__dedup(btf, NULL), "dedup")) > + goto out; > + > + /* Identical elements leave only the first four expected types. */ > + btf_validate_raw(btf, identical ? 4 : 7, (const char *[]) { > + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", > + "[2] STRUCT 'container' size=8 vlen=2\n" > + "\t'first' type_id=3 bits_offset=0\n" > + "\t'second' type_id=3 bits_offset=32", > + "[3] ARRAY '(anon)' type_id=4 index_type_id=1 nr_elems=1", > + "[4] STRUCT 'elem' size=4 vlen=1\n" > + "\t'x' type_id=1 bits_offset=0", > + "[5] STRUCT 'container' size=8 vlen=2\n" > + "\t'first' type_id=3 bits_offset=0\n" > + "\t'second' type_id=6 bits_offset=32", > + "[6] ARRAY '(anon)' type_id=7 index_type_id=1 nr_elems=1", > + "[7] STRUCT 'elem' size=4 vlen=1\n" > + "\t'y' type_id=1 bits_offset=0", > + }); > + > +out: > + btf__free(btf); > +} > + > +void test_btf_dedup(void) > +{ > + if (test__start_subtest("array_different_element_types")) > + test_array_element_types(false); > + if (test__start_subtest("array_identical_element_types")) > + test_array_element_types(true); > +}