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libbpf: Put Kconfig externs into .kconfig section

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Move Kconfig-provided externs into custom .kconfig section. Add __kconfig into
bpf_helpers.h for user convenience. Update selftests accordingly.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191219002837.3074619-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-12-18 16:28:34 -08:00
committed by Alexei Starovoitov
parent d69587062c
commit 81bfdd087b
6 changed files with 60 additions and 48 deletions
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8
tools/bpf/bpftool/gen.c
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@@ -83,8 +83,8 @@ static const char *get_map_ident(const struct bpf_map *map)
return "rodata";
else if (str_has_suffix(name, ".bss"))
return "bss";
else if (str_has_suffix(name, ".extern"))
return "externs"; /* extern is a C keyword */
else if (str_has_suffix(name, ".kconfig"))
return "kconfig";
else
return NULL;
}
@@ -112,8 +112,8 @@ static int codegen_datasec_def(struct bpf_object *obj,
sec_ident = "bss";
else if (strcmp(sec_name, ".rodata") == 0)
sec_ident = "rodata";
else if (strcmp(sec_name, ".extern") == 0)
sec_ident = "externs"; /* extern is a C keyword */
else if (strcmp(sec_name, ".kconfig") == 0)
sec_ident = "kconfig";
else
return 0;