libbpf: Fix compile error in libbpf_attach_type_by_name
Arnaldo Carvalho de Melo reported build error in libbpf when clang
version 3.8.1-24 (tags/RELEASE_381/final) is used:
libbpf.c:2201:36: error: comparison of constant -22 with expression of
type 'const enum bpf_attach_type' is always false
[-Werror,-Wtautological-constant-out-of-range-compare]
if (section_names[i].attach_type == -EINVAL)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~
1 error generated.
Fix the error by keeping "is_attachable" property of a program in a
separate struct field instead of trying to use attach_type itself.
Fixes: 956b620fcf
("libbpf: Introduce libbpf_attach_type_by_name")
Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
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@ -2084,19 +2084,19 @@ void bpf_program__set_expected_attach_type(struct bpf_program *prog,
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prog->expected_attach_type = type;
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}
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#define BPF_PROG_SEC_IMPL(string, ptype, eatype, atype) \
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{ string, sizeof(string) - 1, ptype, eatype, atype }
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#define BPF_PROG_SEC_IMPL(string, ptype, eatype, is_attachable, atype) \
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{ string, sizeof(string) - 1, ptype, eatype, is_attachable, atype }
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/* Programs that can NOT be attached. */
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#define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_IMPL(string, ptype, 0, -EINVAL)
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#define BPF_PROG_SEC(string, ptype) BPF_PROG_SEC_IMPL(string, ptype, 0, 0, 0)
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/* Programs that can be attached. */
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#define BPF_APROG_SEC(string, ptype, atype) \
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BPF_PROG_SEC_IMPL(string, ptype, 0, atype)
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BPF_PROG_SEC_IMPL(string, ptype, 0, 1, atype)
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/* Programs that must specify expected attach type at load time. */
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#define BPF_EAPROG_SEC(string, ptype, eatype) \
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BPF_PROG_SEC_IMPL(string, ptype, eatype, eatype)
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BPF_PROG_SEC_IMPL(string, ptype, eatype, 1, eatype)
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/* Programs that can be attached but attach type can't be identified by section
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* name. Kept for backward compatibility.
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@ -2108,6 +2108,7 @@ static const struct {
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size_t len;
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enum bpf_prog_type prog_type;
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enum bpf_attach_type expected_attach_type;
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int is_attachable;
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enum bpf_attach_type attach_type;
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} section_names[] = {
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BPF_PROG_SEC("socket", BPF_PROG_TYPE_SOCKET_FILTER),
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@ -2198,7 +2199,7 @@ int libbpf_attach_type_by_name(const char *name,
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for (i = 0; i < ARRAY_SIZE(section_names); i++) {
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if (strncmp(name, section_names[i].sec, section_names[i].len))
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continue;
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if (section_names[i].attach_type == -EINVAL)
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if (!section_names[i].is_attachable)
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return -EINVAL;
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*attach_type = section_names[i].attach_type;
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return 0;
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