linux-kernel - [PATCH RFC bpf-next 4/8] bpf: typedef a type for the bpf

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Date: Tue, 07 May 2024 15:19:32 +0200
From: Benjamin Tissoires <bentiss@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, 
 John Fastabend <john.fastabend@...il.com>, 
 Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, 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, Benjamin Tissoires <bentiss@...nel.org>
Subject: [PATCH RFC bpf-next 4/8] bpf: typedef a type for the bpf_wq
 callbacks

This allows users to rely on it by using it from the vmlinux.h

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>

---

This is an RFC, and is not meant to be fully reviewed/applied as it is.
I'm posting this to show what I wanted to explain in
https://lore.kernel.org/bpf/mhkzkf4e23uvljtmwizwcxyuyat2tmfxn33xb4t7waafgmsa66@mcrzpj3b6ssx/
---
 kernel/bpf/helpers.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 2a69a9a36c0f..97628bcbd507 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -2720,8 +2720,10 @@ __bpf_kfunc int bpf_wq_start(struct bpf_wq *wq, unsigned int flags)
 	return 0;
 }
 
+typedef int (*wq_callback_fn_t)(struct bpf_map *map, int *key, struct bpf_wq *wq);
+
 __bpf_kfunc int bpf_wq_set_callback_impl(struct bpf_wq *wq,
-					 int (callback_fn)(void *map, int *key, struct bpf_wq *wq),
+					 wq_callback_fn_t callback_fn__s_async,
 					 unsigned int flags,
 					 void *aux__ign)
 {
@@ -2731,7 +2733,7 @@ __bpf_kfunc int bpf_wq_set_callback_impl(struct bpf_wq *wq,
 	if (flags)
 		return -EINVAL;
 
-	return __bpf_async_set_callback(async, callback_fn, aux, flags, BPF_ASYNC_TYPE_WQ);
+	return __bpf_async_set_callback(async, callback_fn__s_async, aux, flags, BPF_ASYNC_TYPE_WQ);
 }
 
 __bpf_kfunc void bpf_preempt_disable(void)

-- 
2.44.0