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libbpf: Make DECLARE_LIBBPF_OPTS macro strictly a variable declaration

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LIBBPF_OPTS is implemented as a mix of field declaration and memset
+ assignment. This makes it neither variable declaration nor purely
statements, which is a problem, because you can't mix it with either
other variable declarations nor other function statements, because C90
compiler mode emits warning on mixing all that together.

This patch changes LIBBPF_OPTS into a strictly declaration of variable
and solves this problem, as can be seen in case of bpftool, which
previously would emit compiler warning, if done this way (LIBBPF_OPTS as
part of function variables declaration block).

This patch also renames LIBBPF_OPTS into DECLARE_LIBBPF_OPTS to follow
kernel convention for similar macros more closely.

v1->v2:
- rename LIBBPF_OPTS into DECLARE_LIBBPF_OPTS (Jakub Sitnicki).

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20191022172100.3281465-1-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2019-10-22 10:21:00 -07:00 • committed by Daniel Borkmann
parent e13a2fe642
commit e00aca65e6
6 changed files with 21 additions and 16 deletions
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8
tools/bpf/bpftool/prog.c
View file

@ -1091,8 +1091,11 @@ free_data_in:
static int load_with_options(int argc, char **argv, bool first_prog_only)
{
struct bpf_object_load_attr load_attr = { 0 };
enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC;
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts,
.relaxed_maps = relaxed_maps,
);
struct bpf_object_load_attr load_attr = { 0 };
enum bpf_attach_type expected_attach_type;
struct map_replace *map_replace = NULL;
struct bpf_program *prog = NULL, *pos;
@ -1106,9 +1109,6 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
const char *file;
int idx, err;
LIBBPF_OPTS(bpf_object_open_opts, open_opts,
.relaxed_maps = relaxed_maps,
);
if (!REQ_ARGS(2))
return -1;