linux-kernel - [PATCH v2 bpf-next 0/2] bpf: add a ksym BPF iterator

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Message-Id: <1656667620-18718-1-git-send-email-alan.maguire@oracle.com>
Date:   Fri,  1 Jul 2022 10:26:58 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     ast@...nel.org, andrii@...nel.org, daniel@...earbox.net
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, jolsa@...nel.org,
        mhiramat@...nel.org, akpm@...ux-foundation.org, void@...ifault.com,
        swboyd@...omium.org, ndesaulniers@...gle.com,
        9erthalion6@...il.com, kennyyu@...com, geliang.tang@...e.com,
        kuniyu@...zon.co.jp, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 bpf-next 0/2] bpf: add a ksym BPF iterator

a ksym BPF iterator would be useful as it would allow more flexible
interactions with kernel symbols than are currently supported; it could
for example create more efficient map representations for lookup,
speed up symbol resolution etc.

The idea was initially discussed here [1].

Changes since RFC [2]:

- change name of iterator (and associated structures/fields) to "ksym" 
  (Andrii, patches 1, 2)
- remove dependency on CONFIG_PROC_FS; it was used for other BPF
  iterators, and I assumed it was needed because of seq ops but I
  don't think it is required on digging futher (Andrii, patch 1)

[1] https://lore.kernel.org/all/YjRPZj6Z8vuLeEZo@krava/
[2] https://lore.kernel.org/all/1656089118-577-1-git-send-email-alan.maguire@oracle.com/


Alan Maguire (2):
  bpf: add a ksym BPF iterator
  selftests/bpf: add a ksym iter subtest

 kernel/kallsyms.c                                 | 89 +++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 16 ++++
 tools/testing/selftests/bpf/progs/bpf_iter_ksym.c | 71 ++++++++++++++++++
 3 files changed, 176 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_ksym.c

-- 
1.8.3.1