linux-kernel - [PATCH RFC bpf-next 5/7] bpf: introduce bpf_arch_text_poke

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Message-ID: <20251114092450.172024-6-dongml2@chinatelecom.cn>
Date: Fri, 14 Nov 2025 17:24:48 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org,
	rostedt@...dmis.org
Cc: daniel@...earbox.net,
	john.fastabend@...il.com,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	mhiramat@...nel.org,
	mark.rutland@....com,
	mathieu.desnoyers@...icios.com,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH RFC bpf-next 5/7] bpf: introduce bpf_arch_text_poke_type

Introduce the function bpf_arch_text_poke_type(), which is able to specify
both the current and new opcode. If it is not implemented by the arch,
bpf_arch_text_poke() will be called directly if the current opcode is the
same as the new one. Otherwise, -EOPNOTSUPP will be returned.

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 include/linux/bpf.h |  4 ++++
 kernel/bpf/core.c   | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index d65a71042aa3..aec7c65539f5 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -3711,6 +3711,10 @@ enum bpf_text_poke_type {
 	BPF_MOD_JUMP,
 };
 
+int bpf_arch_text_poke_type(void *ip, enum bpf_text_poke_type old_t,
+			    enum bpf_text_poke_type new_t, void *addr1,
+			    void *addr2);
+
 int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
 		       void *addr1, void *addr2);
 
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index d595fe512498..608c636e6cf0 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -3135,6 +3135,16 @@ int __weak bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
 	return -ENOTSUPP;
 }
 
+int __weak bpf_arch_text_poke_type(void *ip, enum bpf_text_poke_type old_t,
+				   enum bpf_text_poke_type new_t, void *old_addr,
+				   void *new_addr)
+{
+	if (old_t == new_t)
+		return bpf_arch_text_poke(ip, old_t, old_addr, new_addr);
+
+	return -EOPNOTSUPP;
+}
+
 void * __weak bpf_arch_text_copy(void *dst, void *src, size_t len)
 {
 	return ERR_PTR(-ENOTSUPP);
-- 
2.51.2