linux-kernel - Re: [PATCH bpf] selftests/bpf: Fix casting error when cross-compiling test

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Date:   Tue, 08 Nov 2022 14:29:45 +0200
From:   Eduard Zingerman <eddyz87@...il.com>
To:     Pu Lehui <pulehui@...weicloud.com>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Pu Lehui <pulehui@...wei.com>
Subject: Re: [PATCH bpf] selftests/bpf: Fix casting error when
 cross-compiling test_verifier for 32-bit platforms

On Tue, 2022-11-08 at 20:19 +0800, Pu Lehui wrote:
> From: Pu Lehui <pulehui@...wei.com>
> 
> 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.

Looks good, sorry missed this case when coding this function...

> 
> Fixes: 933ff53191eb ("selftests/bpf: specify expected instructions in test_verifier tests")
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---
>  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;