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lXdhZVo5_bV7ilCBlUOcwyD4Jdf9J8hb X-Authority-Analysis: v=2.4 cv=CNa/zhrD c=1 sm=1 tr=0 ts=6ab17944 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=BqU2WV_vvsyTyxaotp0D:22 a=yPCof4ZbAAAA:8 a=0Cgan-oSxU9vI9vzlIMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIxMDI3MiBTYWx0ZWRfXx8fb8rLkfVWY RMwVH5cv88XtpA8d1SCy9F5LUb4W3zPgEEyn/G1BwZXJDYzbcjMB9hO9ZxGyuqVcp1h0+L7VkNd 945VK9dnuULrnn8qcRx00cDpb74/Y+0Qh5CKR4Aw2uee8Zs/xjnhJQtQ0OZDOBmVEPr+H3arKx5 wMVDNHTejJZLJjjTZhOPuxUwc0OxY6r9G6vDqset9ODg+SthPFJO23JuLHodXNv27cB9sgOB7ep EGWV0YTaFbebW37NrDUYUs9hpUaONwP1DizjZeBO1588gxexYJqS0/tVCmoea+zi9GyhwAvX1fn 2yBSJAtB4lvTIxzfBX6YXfpTPS0xDlNFj54BvlW4KhK2raFHaPwA6hrXdLny12LNi1VQseq0+zA Q+lN9T1VRjWX0eBjb7CtE3gHlDMkohP3rdva/iiU+BkORPM7lc08iskN4T2g6KEhHE5ublItlym qS8qZB1xW6OgCjNPr4w== X-Proofpoint-ORIG-GUID: lXdhZVo5_bV7ilCBlUOcwyD4Jdf9J8hb On 18/09/2026 20:59, Eduard Zingerman wrote: > On Wed, 2026-09-16 at 08:41 +0100, Alan Maguire wrote: >> When creating distilled BTF, BTF_KIND_FUNC, _LOC_PARAM and _LOC_PROTO >> should be added to split BTF. This means potentially some duplication >> of location information, but only for out-of-tree modules that use >> distilled base/split BTF. >> >> Signed-off-by: Alan Maguire >> --- >> .../selftests/bpf/prog_tests/btf_distill.c | 101 ++++++++++++++++++ >> 1 file changed, 101 insertions(+) >> >> diff --git a/tools/testing/selftests/bpf/prog_tests/btf_distill.c b/tools/testing/selftests/bpf/prog_tests/btf_distill.c >> index fb67ae195a73..141a4cb1f405 100644 >> --- a/tools/testing/selftests/bpf/prog_tests/btf_distill.c >> +++ b/tools/testing/selftests/bpf/prog_tests/btf_distill.c >> @@ -671,6 +671,105 @@ static void test_distilled_base_embedded_err(void) >> btf__free(btf1); >> } >> >> +/* LOC_PARAM, LOC_PROTO should be added to split BTF. */ >> +static void test_distilled_loc(void) >> +{ >> + struct btf *btf1 = NULL, *btf2 = NULL, *btf3 = NULL; >> + struct btf *btf4 = NULL, *btf5 = NULL; >> + >> + btf1 = btf__new_empty(); >> + if (!ASSERT_OK_PTR(btf1, "empty_main_btf")) >> + return; >> + >> + btf__add_int(btf1, "int", 4, BTF_INT_SIGNED); /* [1] int */ >> + btf__add_func_proto(btf1, 1); /* [2] int (*)(int); */ >> + btf__add_func_param(btf1, "p1", 1); >> + btf__add_func(btf1, "foo", BTF_FUNC_STATIC, 2); /* [3] int foo(int); */ >> + btf__add_loc_param(btf1, 4, BTF_LOC_PARAM_SIGNED | BTF_LOC_PARAM_CONST); >> + btf__add_loc_param_value(btf1, -1); /* [4] loc value */ >> + btf__add_loc_proto(btf1); /* [5] loc proto */ >> + btf__add_loc_proto_param(btf1, 4); /* param value */ >> + >> + VALIDATE_RAW_BTF( >> + btf1, >> + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", >> + "[2] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" >> + "\t'p1' type_id=1", >> + "[3] FUNC 'foo' type_id=2 linkage=static", >> + "[4] LOC_PARAM '(anon)' size=4 flags=0x3 vlen=1\n" >> + "\tvalue=-1", >> + "[5] LOC_PROTO '(anon)' vlen=1\n" >> + "\ttype_id=4"); > > Maybe also add an unrelated type to the base, such that effects of the > distill are visible? > yep, good idea, will do. >> + btf2 = btf__new_empty_split(btf1); >> + if (!ASSERT_OK_PTR(btf2, "empty_split_btf")) >> + goto cleanup; >> + >> + btf__add_locsec(btf2, "inline.text"); /* [6] locsec */ >> + btf__add_locsec_loc(btf2, 3, 5, 256); /* "foo" offset 256 */ >> + VALIDATE_RAW_BTF( >> + btf2, >> + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", >> + "[2] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" >> + "\t'p1' type_id=1", >> + "[3] FUNC 'foo' type_id=2 linkage=static", >> + "[4] LOC_PARAM '(anon)' size=4 flags=0x3 vlen=1\n" >> + "\tvalue=-1", >> + "[5] LOC_PROTO '(anon)' vlen=1\n" >> + "\ttype_id=4", >> + "[6] LOCSEC 'inline.text' vlen=1\n" >> + "\tfunc_type_id=3 loc_proto_type_id=5 offset=256"); >> + >> + if (!ASSERT_EQ(0, btf__distill_base(btf2, &btf3, &btf4), >> + "distilled_base") || >> + !ASSERT_OK_PTR(btf3, "distilled_base") || >> + !ASSERT_OK_PTR(btf4, "distilled_split") || >> + !ASSERT_EQ(2, btf__type_cnt(btf3), "distilled_base_type_cnt")) >> + goto cleanup; >> + >> + VALIDATE_RAW_BTF( >> + btf4, >> + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", >> + /* remainder is split BTF */ >> + "[2] LOCSEC 'inline.text' vlen=1\n" >> + "\tfunc_type_id=4 loc_proto_type_id=6 offset=256", >> + "[3] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" >> + "\t'p1' type_id=1", >> + "[4] FUNC 'foo' type_id=3 linkage=static", >> + "[5] LOC_PARAM '(anon)' size=4 flags=0x3 vlen=1\n" >> + "\tvalue=-1", >> + "[6] LOC_PROTO '(anon)' vlen=1\n" >> + "\ttype_id=5"); >> + >> + btf5 = btf__new_empty(); >> + if (!ASSERT_OK_PTR(btf5, "empty_reloc_btf")) >> + goto cleanup; > > I'd add another btf__add_ here to shift the ides and make > sure that relocate actually did something. > makes sense. Will add for v4. Thanks!