linux-kernel - Re: [PATCH bpf-next 1/2] bpf: helpers: fix bpf_wq_set_callback

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Message-ID: <23da6ae19d3cc17b445b77e18e2ac98c490f9b7b.camel@gmail.com>
Date: Fri, 05 Jul 2024 13:58:05 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Benjamin Tissoires <bentiss@...nel.org>, 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>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>,  Mykola Lysenko <mykolal@...com>, Shuah Khan
 <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/2] bpf: helpers: fix bpf_wq_set_callback_impl
 signature

On Fri, 2024-07-05 at 15:44 +0200, Benjamin Tissoires wrote:
> I realized this while having a map containing both a struct bpf_timer and
> a struct bpf_wq: the third argument provided to the bpf_wq callback is
> not the struct bpf_wq pointer itself, but the pointer to the value in
> the map.
> 
> Which means that the users need to double cast the provided "value" as
> this is not a struct bpf_wq *.
> 
> This is a change of API, but there doesn't seem to be much users of bpf_wq
> right now, so we should be able to go with this right now.
> 
> Fixes: 81f1d7a583fa ("bpf: wq: add bpf_wq_set_callback_impl")
> Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
> ---

Reviewed-by: Eduard Zingerman <eddyz87@...il.com>