Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/samples/bpf/sockex2_user.c b/samples/bpf/sockex2_user.c
index 1d5c6e9..6de383d 100644
--- a/samples/bpf/sockex2_user.c
+++ b/samples/bpf/sockex2_user.c
@@ -3,7 +3,7 @@
 #include <assert.h>
 #include <linux/bpf.h>
 #include <bpf/bpf.h>
-#include "bpf_load.h"
+#include "libbpf.h"
 #include "sock_example.h"
 #include <unistd.h>
 #include <arpa/inet.h>
@@ -17,32 +17,35 @@
 int main(int ac, char **argv)
 {
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
+	struct bpf_object *obj;
+	int map_fd, prog_fd;
 	char filename[256];
-	FILE *f;
 	int i, sock;
+	FILE *f;
 
 	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 	setrlimit(RLIMIT_MEMLOCK, &r);
 
-	if (load_bpf_file(filename)) {
-		printf("%s", bpf_log_buf);
+	if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
+			  &obj, &prog_fd))
 		return 1;
-	}
+
+	map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
 
 	sock = open_raw_sock("lo");
 
-	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
-			  sizeof(prog_fd[0])) == 0);
+	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
+			  sizeof(prog_fd)) == 0);
 
-	f = popen("ping -c5 localhost", "r");
+	f = popen("ping -4 -c5 localhost", "r");
 	(void) f;
 
 	for (i = 0; i < 5; i++) {
 		int key = 0, next_key;
 		struct pair value;
 
-		while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
-			bpf_map_lookup_elem(map_fd[0], &next_key, &value);
+		while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
+			bpf_map_lookup_elem(map_fd, &next_key, &value);
 			printf("ip %s bytes %lld packets %lld\n",
 			       inet_ntoa((struct in_addr){htonl(next_key)}),
 			       value.bytes, value.packets);