[PATCH bpf] selftests/bpf: Fix casting error when cross-compiling test_verifier for 32-bit platforms

[Pu Lehui]

From: Pu Lehui <pulehui@xxxxxxxxxx>

When cross-compiling test_verifier for 32-bit platforms, the casting error is shown below:

test_verifier.c:1263:27: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
 1263 |  info.xlated_prog_insns = (__u64)*buf;
      |                           ^
cc1: all warnings being treated as errors

Fix it by adding zero-extension for it.

Fixes: 933ff53191eb ("selftests/bpf: specify expected instructions in test_verifier tests")
Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
---
 tools/testing/selftests/bpf/test_verifier.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 2dbcbf363c18..b605a70d4f6b 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -1260,7 +1260,7 @@ static int get_xlated_program(int fd_prog, struct bpf_insn **buf, int *cnt)
 
 	bzero(&info, sizeof(info));
 	info.xlated_prog_len = xlated_prog_len;
-	info.xlated_prog_insns = (__u64)*buf;
+	info.xlated_prog_insns = (__u64)(unsigned long)*buf;
 	if (bpf_obj_get_info_by_fd(fd_prog, &info, &info_len)) {
 		perror("second bpf_obj_get_info_by_fd failed");
 		goto out_free_buf;
-- 
2.25.1