From: Jiri Olsa <olsajiri@gmail.com>
To: sashiko-reviews@lists.linux.dev
Cc: bpf@vger.kernel.org
Subject: Re: [PATCHv7 bpf-next 04/29] bpf: Use mutex lock pool for bpf trampolines
Date: Thu, 4 Jun 2026 09:59:23 +0200 [thread overview]
Message-ID: <aiEwW3-dzi8Y5d0n@krava> (raw)
In-Reply-To: <20260603112900.318991F00893@smtp.kernel.org>
On Wed, Jun 03, 2026 at 11:28:59AM +0000, sashiko-bot@kernel.org wrote:
> Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
> - [Low] Multi-line comments modified by the patch do not follow the mandatory BPF subsystem comment style.
> --
>
> commit 107ed36e35d617129f1228fd0db67188b4ce4a98
> Author: Jiri Olsa <jolsa@kernel.org>
>
> bpf: Use mutex lock pool for bpf trampolines
>
> This commit replaces the per-trampoline mutex with a mutex pool to
> prevent lockdep warnings when attaching multiple trampolines during
> tracing_multi link. Trampolines are hashed to one of 32 pool locks,
> keeping the maximum simultaneous locks below the 48 lock limit.
>
> > diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
> > index a4298a25d4bae..c0b4732627bef 100644
> > --- a/kernel/bpf/trampoline.c
> > +++ b/kernel/bpf/trampoline.c
> [ ... ]
> > @@ -99,12 +128,12 @@ static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, unsigned long ip,
> [ ... ]
> > - if (!mutex_trylock(&tr->mutex)) {
> > - /* sleep 1 ms to make sure whatever holding tr->mutex makes
> > - * some progress.
> > + if (!mutex_trylock(select_trampoline_lock(tr))) {
> > + /* sleep 1 ms to make sure whatever holding select_trampoline_lock(tr)
> > + * makes some progress.
> > */
>
> [Severity: Low]
> This isn't a bug, but since this multi-line comment in
> bpf_tramp_ftrace_ops_func() is being modified, should it be updated to
> follow the BPF subsystem comment style, with the opening /* on its own line?
already answered in here: https://lore.kernel.org/bpf/ahg_YFpqlTGYQUay@krava/
jirka
next prev parent reply other threads:[~2026-06-04 7:59 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-03 11:05 [PATCHv7 bpf-next 00/29] bpf: tracing_multi link Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 01/29] ftrace: Add ftrace_hash_count function Jiri Olsa
2026-06-03 11:26 ` sashiko-bot
2026-06-04 7:59 ` Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 02/29] ftrace: Add ftrace_hash_remove function Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 03/29] ftrace: Add add_ftrace_hash_entry function Jiri Olsa
2026-06-09 14:29 ` Steven Rostedt
2026-06-09 14:43 ` Kumar Kartikeya Dwivedi
2026-06-03 11:05 ` [PATCHv7 bpf-next 04/29] bpf: Use mutex lock pool for bpf trampolines Jiri Olsa
2026-06-03 11:28 ` sashiko-bot
2026-06-04 7:59 ` Jiri Olsa [this message]
2026-06-03 11:05 ` [PATCHv7 bpf-next 05/29] bpf: Add struct bpf_trampoline_ops object Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 06/29] bpf: Move trampoline image setup into bpf_trampoline_ops callbacks Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 07/29] bpf: Add bpf_trampoline_add/remove_prog functions Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 08/29] bpf: Add struct bpf_tramp_node object Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 09/29] bpf: Factor fsession link to use struct bpf_tramp_node Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 10/29] bpf: Add multi tracing attach types Jiri Olsa
2026-06-03 11:37 ` sashiko-bot
2026-06-04 8:00 ` Jiri Olsa
2026-06-03 11:52 ` bot+bpf-ci
2026-06-03 11:05 ` [PATCHv7 bpf-next 11/29] bpf: Move sleepable verification code to btf_id_allow_sleepable Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 12/29] bpf: Add bpf_trampoline_multi_attach/detach functions Jiri Olsa
2026-06-03 11:52 ` bot+bpf-ci
2026-06-03 11:05 ` [PATCHv7 bpf-next 13/29] bpf: Add support for tracing multi link Jiri Olsa
2026-06-03 11:41 ` sashiko-bot
2026-06-04 8:00 ` Jiri Olsa
2026-06-03 11:52 ` bot+bpf-ci
2026-06-04 8:00 ` Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 14/29] bpf: Add support for tracing_multi link cookies Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 15/29] bpf: Add support for tracing_multi link session Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 16/29] bpf: Add support for tracing_multi link fdinfo Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 17/29] libbpf: Add bpf_object_cleanup_btf function Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 18/29] libbpf: Add bpf_link_create support for tracing_multi link Jiri Olsa
2026-06-03 11:34 ` sashiko-bot
2026-06-04 7:59 ` Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 19/29] libbpf: Add btf_type_is_traceable_func function Jiri Olsa
2026-06-03 11:36 ` sashiko-bot
2026-06-04 7:59 ` Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 20/29] libbpf: Add support to create tracing multi link Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 21/29] selftests/bpf: Add tracing multi skel/pattern/ids attach tests Jiri Olsa
2026-06-03 13:40 ` sashiko-bot
2026-06-04 8:00 ` Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 22/29] selftests/bpf: Add tracing multi skel/pattern/ids module " Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 23/29] selftests/bpf: Add tracing multi intersect tests Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 24/29] selftests/bpf: Add tracing multi cookies test Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 25/29] selftests/bpf: Add tracing multi session test Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 26/29] selftests/bpf: Add tracing multi attach fails test Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 27/29] selftests/bpf: Add tracing multi verifier " Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 28/29] selftests/bpf: Add tracing multi attach benchmark test Jiri Olsa
2026-06-03 11:05 ` [PATCHv7 bpf-next 29/29] selftests/bpf: Add tracing multi attach rollback tests Jiri Olsa
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