linux-kernel - Re: [PATCH bpf-next v3 4/6] libbpf: Unify memory address casting operation style

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Message-ID: <a31efed5-a436-49c9-4126-902303df9766@iogearbox.net>
Date:   Mon, 30 May 2022 23:03:01 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Pu Lehui <pulehui@...wei.com>, bpf@...r.kernel.org,
        linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH bpf-next v3 4/6] libbpf: Unify memory address casting
 operation style

On 5/30/22 11:28 AM, Pu Lehui wrote:
> The members of bpf_prog_info, which are line_info, jited_line_info,
> jited_ksyms and jited_func_lens, store u64 address pointed to the
> corresponding memory regions. Memory addresses are conceptually
> unsigned, (unsigned long) casting makes more sense, so let's make
> a change for conceptual uniformity.
> 
> Signed-off-by: Pu Lehui <pulehui@...wei.com>
> ---
>   tools/lib/bpf/bpf_prog_linfo.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/lib/bpf/bpf_prog_linfo.c b/tools/lib/bpf/bpf_prog_linfo.c
> index 5c503096ef43..7beb060d0671 100644
> --- a/tools/lib/bpf/bpf_prog_linfo.c
> +++ b/tools/lib/bpf/bpf_prog_linfo.c
> @@ -127,7 +127,8 @@ struct bpf_prog_linfo *bpf_prog_linfo__new(const struct bpf_prog_info *info)
>   	prog_linfo->raw_linfo = malloc(data_sz);
>   	if (!prog_linfo->raw_linfo)
>   		goto err_free;
> -	memcpy(prog_linfo->raw_linfo, (void *)(long)info->line_info, data_sz);
> +	memcpy(prog_linfo->raw_linfo, (void *)(unsigned long)info->line_info,
> +	       data_sz);

Took in patch 1-3, lgtm, thanks! My question around the cleanups in patch 4-6 ...
there are various other such cases e.g. in libbpf, perhaps makes sense to clean all
of them up at once and not just the 4 locations in here.

Thanks,
Daniel