linux-kernel - Re: [bpf-next v4] libbpf: Add pathname

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Date:   Fri, 23 Sep 2022 14:30:53 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Wang Yufen <wangyufen@...wei.com>
Cc:     andrii@...nel.org, ast@...nel.org, daniel@...earbox.net,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, davem@...emloft.net,
        kuba@...nel.org, hawk@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, trix@...hat.com, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [bpf-next v4] libbpf: Add pathname_concat() helper

On Wed, Sep 21, 2022 at 11:08 PM Wang Yufen <wangyufen@...wei.com> wrote:
>
> Move snprintf and len check to common helper pathname_concat() to make the
> code simpler.
>
> Signed-off-by: Wang Yufen <wangyufen@...wei.com>
> ---
>  tools/lib/bpf/libbpf.c | 76 +++++++++++++++++++-------------------------------
>  1 file changed, 29 insertions(+), 47 deletions(-)
>

You went a bit overboard with libbpf_err(). We need it only in
directly user-facing functions. I've fixed it up while applying. Also
moved buf and buffer size to be first two arguments to match
snprintf() order of arguments a bit closer. Applied to bpf-next,
thanks.

> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 2ca30cc..2d8b195 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -2096,19 +2096,30 @@ static bool get_map_field_int(const char *map_name, const struct btf *btf,
>         return true;
>  }

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