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Message-ID: <20181119232910.145376-1-kafai@fb.com>
Date: Mon, 19 Nov 2018 15:29:10 -0800
From: Martin KaFai Lau <kafai@...com>
To: <netdev@...r.kernel.org>
CC: Alexei Starovoitov <ast@...com>,
Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>,
Yonghong Song <yhs@...com>
Subject: [PATCH v5 bpf-next 04/13] tools/bpf: Add tests for BTF_KIND_FUNC_PROTO and BTF_KIND_FUNC
This patch adds unit tests for BTF_KIND_FUNC_PROTO and
BTF_KIND_FUNC to test_btf.
Signed-off-by: Martin KaFai Lau <kafai@...com>
Signed-off-by: Yonghong Song <yhs@...com>
---
tools/lib/bpf/btf.c | 4 +
tools/testing/selftests/bpf/test_btf.c | 474 ++++++++++++++++++++++++-
2 files changed, 476 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
index 449591aa9900..31225e64766f 100644
--- a/tools/lib/bpf/btf.c
+++ b/tools/lib/bpf/btf.c
@@ -165,6 +165,10 @@ static int btf_parse_type_sec(struct btf *btf, btf_print_fn_t err_log)
case BTF_KIND_ENUM:
next_type += vlen * sizeof(struct btf_enum);
break;
+ case BTF_KIND_FUNC_PROTO:
+ next_type += vlen * sizeof(struct btf_param);
+ break;
+ case BTF_KIND_FUNC:
case BTF_KIND_TYPEDEF:
case BTF_KIND_PTR:
case BTF_KIND_FWD:
diff --git a/tools/testing/selftests/bpf/test_btf.c b/tools/testing/selftests/bpf/test_btf.c
index f42b3396d622..e0eeee5c8c04 100644
--- a/tools/testing/selftests/bpf/test_btf.c
+++ b/tools/testing/selftests/bpf/test_btf.c
@@ -85,8 +85,20 @@ static int __base_pr(const char *format, ...)
#define BTF_TYPEDEF_ENC(name, type) \
BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_TYPEDEF, 0, 0), type)
-#define BTF_PTR_ENC(name, type) \
- BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_PTR, 0, 0), type)
+#define BTF_PTR_ENC(type) \
+ BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_PTR, 0, 0), type)
+
+#define BTF_CONST_ENC(type) \
+ BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_CONST, 0, 0), type)
+
+#define BTF_FUNC_PROTO_ENC(ret_type, nargs) \
+ BTF_TYPE_ENC(0, BTF_INFO_ENC(BTF_KIND_FUNC_PROTO, 0, nargs), ret_type)
+
+#define BTF_FUNC_PROTO_ARG_ENC(name, type) \
+ (name), (type)
+
+#define BTF_FUNC_ENC(name, func_proto) \
+ BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_FUNC, 0, 0), func_proto)
#define BTF_END_RAW 0xdeadbeef
#define NAME_TBD 0xdeadb33f
@@ -1374,6 +1386,464 @@ static struct btf_raw_test raw_tests[] = {
.map_create_err = true,
},
+{
+ .descr = "func proto (int (*)(int, unsigned int))",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* int (*)(int, unsigned int) */
+ BTF_FUNC_PROTO_ENC(1, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "",
+ .str_sec_size = sizeof(""),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func proto (vararg)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int, unsigned int, ...) */
+ BTF_FUNC_PROTO_ENC(0, 3), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_FUNC_PROTO_ARG_ENC(0, 0),
+ BTF_END_RAW,
+ },
+ .str_sec = "",
+ .str_sec_size = sizeof(""),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func proto (vararg with name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int b, ... c) */
+ BTF_FUNC_PROTO_ENC(0, 3), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 0),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b\0c",
+ .str_sec_size = sizeof("\0a\0b\0c"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#3",
+},
+
+{
+ .descr = "func proto (arg after vararg)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, ..., unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 3), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 0),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b",
+ .str_sec_size = sizeof("\0a\0b"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#2",
+},
+
+{
+ .descr = "func proto (CONST=>TYPEDEF=>PTR=>FUNC_PROTO)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* typedef void (*func_ptr)(int, unsigned int) */
+ BTF_TYPEDEF_ENC(NAME_TBD, 5), /* [3] */
+ /* const func_ptr */
+ BTF_CONST_ENC(3), /* [4] */
+ BTF_PTR_ENC(6), /* [5] */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [6] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0func_ptr",
+ .str_sec_size = sizeof("\0func_ptr"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func proto (CONST=>TYPEDEF=>FUNC_PROTO)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ BTF_CONST_ENC(4), /* [3] */
+ BTF_TYPEDEF_ENC(NAME_TBD, 5), /* [4] */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [5] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0func_typedef",
+ .str_sec_size = sizeof("\0func_typedef"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid type_id",
+},
+
+{
+ .descr = "func proto (btf_resolve(arg))",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ /* void (*)(const void *) */
+ BTF_FUNC_PROTO_ENC(0, 1), /* [2] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 3),
+ BTF_CONST_ENC(4), /* [3] */
+ BTF_PTR_ENC(0), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "",
+ .str_sec_size = sizeof(""),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func proto (Not all arg has name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int, unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0b",
+ .str_sec_size = sizeof("\0b"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func proto (Bad arg name_off)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int <bad_name_off>) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0xffffffff, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a",
+ .str_sec_size = sizeof("\0a"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#2",
+},
+
+{
+ .descr = "func proto (Bad arg name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int !!!) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0!!!",
+ .str_sec_size = sizeof("\0a\0!!!"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#2",
+},
+
+{
+ .descr = "func proto (Invalid return type)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* <bad_ret_type> (*)(int, unsigned int) */
+ BTF_FUNC_PROTO_ENC(100, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "",
+ .str_sec_size = sizeof(""),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid return type",
+},
+
+{
+ .descr = "func proto (with func name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void func_proto(int, unsigned int) */
+ BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_FUNC_PROTO, 0, 2), 0), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ BTF_END_RAW,
+ },
+ .str_sec = "\0func_proto",
+ .str_sec_size = sizeof("\0func_proto"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid name",
+},
+
+{
+ .descr = "func proto (const void arg)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(const void) */
+ BTF_FUNC_PROTO_ENC(0, 1), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(0, 4),
+ BTF_CONST_ENC(0), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "",
+ .str_sec_size = sizeof(""),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_proto_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#1",
+},
+
+{
+ .descr = "func (void func(int a, unsigned int b))",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ /* void func(int a, unsigned int b) */
+ BTF_FUNC_ENC(NAME_TBD, 3), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b\0func",
+ .str_sec_size = sizeof("\0a\0b\0func"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+},
+
+{
+ .descr = "func (No func name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ /* void <no_name>(int a, unsigned int b) */
+ BTF_FUNC_ENC(0, 3), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b",
+ .str_sec_size = sizeof("\0a\0b"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid name",
+},
+
+{
+ .descr = "func (Invalid func name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ /* void !!!(int a, unsigned int b) */
+ BTF_FUNC_ENC(NAME_TBD, 3), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b\0!!!",
+ .str_sec_size = sizeof("\0a\0b\0!!!"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid name",
+},
+
+{
+ .descr = "func (Some arg has no name)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(0, 2),
+ /* void func(int a, unsigned int) */
+ BTF_FUNC_ENC(NAME_TBD, 3), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0func",
+ .str_sec_size = sizeof("\0a\0func"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid arg#2",
+},
+
+{
+ .descr = "func (Non zero vlen)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_TYPE_INT_ENC(0, 0, 0, 32, 4), /* [2] */
+ /* void (*)(int a, unsigned int b) */
+ BTF_FUNC_PROTO_ENC(0, 2), /* [3] */
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 1),
+ BTF_FUNC_PROTO_ARG_ENC(NAME_TBD, 2),
+ /* void func(int a, unsigned int b) */
+ BTF_TYPE_ENC(NAME_TBD, BTF_INFO_ENC(BTF_KIND_FUNC, 0, 2), 3), /* [4] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0a\0b\0func",
+ .str_sec_size = sizeof("\0a\0b\0func"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "vlen != 0",
+},
+
+{
+ .descr = "func (Not referring to FUNC_PROTO)",
+ .raw_types = {
+ BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
+ BTF_FUNC_ENC(NAME_TBD, 1), /* [2] */
+ BTF_END_RAW,
+ },
+ .str_sec = "\0func",
+ .str_sec_size = sizeof("\0func"),
+ .map_type = BPF_MAP_TYPE_ARRAY,
+ .map_name = "func_type_check_btf",
+ .key_size = sizeof(int),
+ .value_size = sizeof(int),
+ .key_type_id = 1,
+ .value_type_id = 1,
+ .max_entries = 4,
+ .btf_load_err = true,
+ .err_str = "Invalid type_id",
+},
+
}; /* struct btf_raw_test raw_tests[] */
static const char *get_next_str(const char *start, const char *end)
--
2.17.1
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