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Date:   Wed, 13 May 2020 12:38:33 -0700
From:   Alexei Starovoitov <>
To:     Yonghong Song <>
Cc:     Andrii Nakryiko <>,,
        Martin KaFai Lau <>,,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
Subject: Re: [PATCH bpf-next v2 0/7] bpf: misc fixes for bpf_iter

On Wed, May 13, 2020 at 11:02:15AM -0700, Yonghong Song wrote:
> Commit ae24345da54e ("bpf: Implement an interface to register
> bpf_iter targets") and its subsequent commits in the same patch set
> introduced bpf iterator, a way to run bpf program when iterating
> kernel data structures.
> This patch set addressed some followup issues. One big change
> is to allow target to pass ctx arg register types to verifier
> for verification purpose. Please see individual patch for details.
> Changelogs:
>   v1 -> v2:
>     . add "const" qualifier to struct bpf_iter_reg for
>       bpf_iter_[un]reg_target, and this results in
>       additional "const" qualifiers in some other places
>     . drop the patch which will issue WARN_ONCE if
>       seq_ops->show() returns a positive value.
>       If this does happen, code review should spot
>       this or author does know what he is doing.
>       In the future, we do want to implement a
>       mechanism to find out all registered targets
>       so we will be aware of new additions.

Applied, Thanks

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