libbpf: fix array_size.cocci warning

Fix the following coccicheck warning: tools/lib/bpf/bpf.c:114:31-32: WARNING: Use ARRAY_SIZE tools/lib/bpf/xsk.c:484:34-35: WARNING: Use ARRAY_SIZE tools/lib/bpf/xsk.c:485:35-36: WARNING: Use ARRAY_SIZE It has been tested with gcc (Debian 8.3.0-6) 8.3.0 on x86_64. Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>

Author: Guo Zhengkui

tools/lib/bpf/bpf.c

@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <linux/bpf.h>
 #include <linux/filter.h>
+#include <linux/kernel.h>
 #include <limits.h>
 #include <sys/resource.h>
 #include "bpf.h"
@@ -111,7 +112,7 @@ int probe_memcg_account(void)
 BPF_EMIT_CALL(BPF_FUNC_ktime_get_coarse_ns),
 BPF_EXIT_INSN(),
 };
-size_t insn_cnt = sizeof(insns) / sizeof(insns[0]);
+size_t insn_cnt = ARRAY_SIZE(insns);
 union bpf_attr attr;
 int prog_fd;
 

tools/lib/bpf/xsk.c

@@ -481,8 +481,8 @@ static int xsk_load_xdp_prog(struct xsk_socket *xsk)
 BPF_EMIT_CALL(BPF_FUNC_redirect_map),
 BPF_EXIT_INSN(),
 };
-size_t insns_cnt[] = {sizeof(prog) / sizeof(struct bpf_insn),
- sizeof(prog_redirect_flags) / sizeof(struct bpf_insn),
+size_t insns_cnt[] = {ARRAY_SIZE(prog),
+ ARRAY_SIZE(prog_redirect_flags),
 };
 struct bpf_insn *progs[] = {prog, prog_redirect_flags};
 enum xsk_prog option = get_xsk_prog();