netdev - Re: [PATCH v10 bpf-next 00/14] bpf: Add d

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Message-ID: <20200807163503.ytoej6qxsjuedty7@ast-mbp.dhcp.thefacebook.com>
Date:   Fri, 7 Aug 2020 09:35:03 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v10 bpf-next 00/14] bpf: Add d_path helper

On Fri, Aug 07, 2020 at 11:45:45AM +0200, Jiri Olsa wrote:
> hi,
> adding d_path helper function that returns full path for
> given 'struct path' object, which needs to be the kernel
> BTF 'path' object. The path is returned in buffer provided
> 'buf' of size 'sz' and is zero terminated.
> 
>   long bpf_d_path(struct path *path, char *buf, u32 sz);
> 
> The helper calls directly d_path function, so there's only
> limited set of function it can be called from.
> 
> The patchset also adds support to add set of BTF IDs for
> a helper to define functions that the helper is allowed
> to be called from.
> 
> Also available at:
>   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   bpf/d_path
> 
> v10 changes:
>   - added few acks
>   - returned long instead of int in bpf_d_path helper [Alexei]
>   - used local cnt variable in d_path test [Andrii]
>   - fixed tyo in d_path comment [Andrii]
>   - get rid of reg->off condition in check_func_arg [Andrii]

bpf-next is closed.
I still encourage developers to submit new features for review, but please tag
them as RFC, so the purpose is clear to both maintainers and authors.