On Wed, Dec 1, 2021 at 8:50 AM Alexander Lobakin
<alexandr.lobakin@xxxxxxxxx> wrote:
>
> Fix the following samples/bpf build error appeared after the
> introduction of bpf_map_create() in libbpf:
>
> CC samples/bpf/fds_example.o
> samples/bpf/fds_example.c:49:12: error: static declaration of 'bpf_map_create' follows non-static declaration
> static int bpf_map_create(void)
> ^
> samples/bpf/libbpf/include/bpf/bpf.h:55:16: note: previous declaration is here
> LIBBPF_API int bpf_map_create(enum bpf_map_type map_type,
> ^
> samples/bpf/fds_example.c:82:23: error: too few arguments to function call, expected 6, have 0
> fd = bpf_map_create();
> ~~~~~~~~~~~~~~ ^
> samples/bpf/libbpf/include/bpf/bpf.h:55:16: note: 'bpf_map_create' declared here
> LIBBPF_API int bpf_map_create(enum bpf_map_type map_type,
> ^
> 2 errors generated.
>
> fds_example by accident has a static function with the same name.
> It's not worth it to separate a single call into its own function,
> so just embed it.
>
> Fixes: 992c4225419a ("libbpf: Unify low-level map creation APIs w/ new bpf_map_create()")
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
> ---
> samples/bpf/fds_example.c | 9 ++-------
> 1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c
> index 59f45fef5110..9a7c1fd7a4a8 100644
> --- a/samples/bpf/fds_example.c
> +++ b/samples/bpf/fds_example.c
> @@ -46,12 +46,6 @@ static void usage(void)
> printf(" -h Display this help.\n");
> }
>
> -static int bpf_map_create(void)
> -{
> - return bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
> - sizeof(uint32_t), 1024, 0);
> -}
> -
> static int bpf_prog_create(const char *object)
> {
> static struct bpf_insn insns[] = {
> @@ -79,7 +73,8 @@ static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
> int fd, ret;
>
> if (flags & BPF_F_PIN) {
> - fd = bpf_map_create();
> + fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
> + sizeof(uint32_t), 1024, 0);
Would be even better to use bpf_map_create() API instead, but that's
fine, I'm sending a big clean up patch for this and other uses of
deprecated APIs in samples/bpf. Applied to bpf-next.
> printf("bpf: map fd:%d (%s)\n", fd, strerror(errno));
> assert(fd > 0);
>
> --
> 2.33.1
>
