linux-kernel - Re: [PATCH v1 2/7] bpf: Add bpf_perf_event_aux

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Message-ID: <3790244e9b6f5508ef54eb799ed5b6e6a9d72b3a.camel@gmail.com>
Date: Mon, 21 Jul 2025 15:32:31 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Leo Yan <leo.yan@....com>, Yonghong Song <yonghong.song@...ux.dev>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Adrian Hunter	
 <adrian.hunter@...el.com>, Namhyung Kim <namhyung@...nel.org>, Jiri Olsa	
 <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, James Clark	
 <james.clark@...aro.org>, "Liang, Kan" <kan.liang@...ux.intel.com>, Alexei
 Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>,  Martin KaFai Lau
 <martin.lau@...ux.dev>, Song Liu <song@...nel.org>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>,  Matt Bobrowski
 <mattbobrowski@...gle.com>, Steven Rostedt <rostedt@...dmis.org>, Masami
 Hiramatsu	 <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, 	linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, 	bpf@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Suzuki K Poulose	
 <suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>
Subject: Re: [PATCH v1 2/7] bpf: Add bpf_perf_event_aux_pause kfunc

On Fri, 2025-07-18 at 16:38 +0100, Leo Yan wrote:

[...]

> Just clarify one thing, I defined the kfunc in new patch:
> 
>   int bpf_perf_event_aux_pause(void *p__map, u64 flags, u32 pause)
> 
> Unlike your suggestion, I defined the first parameter as "void
> *p__map" (I refers to bpf_arena_alloc_pages()) rather than
> "struct bpf_map *map". This is because the BPF program will pass a
> variable from the map section, rather than passing a map pointer.

This is correct,
see commit 8d94f1357c00 ("bpf: Recognize '__map' suffix in kfunc arguments")

[...]