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Tue, 28 Oct 2025 19:15:20 -0700 (PDT) Received: from 7950hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b712d024aaasm12124442a12.26.2025.10.28.19.15.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Oct 2025 19:15:20 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: mhiramat@kernel.org Cc: rostedt@goodmis.org, jolsa@kernel.org, mathieu.desnoyers@efficios.com, jiang.biao@linux.dev, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH] tracing: fprobe: use ftrace if CONFIG_DYNAMIC_FTRACE_WITH_ARGS Date: Wed, 29 Oct 2025 10:15:14 +0800 Message-ID: <20251029021514.25076-1-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.51.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For now, we will use ftrace for the fprobe if fp->exit_handler not exists and CONFIG_DYNAMIC_FTRACE_WITH_REGS is enabled. However, CONFIG_DYNAMIC_FTRACE_WITH_REGS is not supported by some arch, such as arm. What we need in the fprobe is the function arguments, so we can use ftrace for fprobe if CONFIG_DYNAMIC_FTRACE_WITH_ARGS is enabled. Therefore, use ftrace if CONFIG_DYNAMIC_FTRACE_WITH_REGS or CONFIG_DYNAMIC_FTRACE_WITH_ARGS enabled. Signed-off-by: Menglong Dong --- kernel/trace/fprobe.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index ecd623eef68b..9fad0569f521 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -254,7 +254,11 @@ static inline int __fprobe_kprobe_handler(unsigned lon= g ip, unsigned long parent return ret; } =20 -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#if defined(CONFIG_DYNAMIC_FTRACE_WITH_ARGS) || defined(CONFIG_DYNAMIC_FTR= ACE_WITH_REGS) +#define FPROBE_USE_FTRACE +#endif + +#ifdef FPROBE_USE_FTRACE /* ftrace_ops callback, this processes fprobes which have only entry_handl= er. */ static void fprobe_ftrace_entry(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *ops, struct ftrace_regs *fregs) @@ -295,7 +299,7 @@ NOKPROBE_SYMBOL(fprobe_ftrace_entry); =20 static struct ftrace_ops fprobe_ftrace_ops =3D { .func =3D fprobe_ftrace_entry, - .flags =3D FTRACE_OPS_FL_SAVE_REGS, + .flags =3D FTRACE_OPS_FL_SAVE_ARGS, }; static int fprobe_ftrace_active; =20 @@ -349,7 +353,7 @@ static bool fprobe_is_ftrace(struct fprobe *fp) { return false; } -#endif +#endif /* !FPROBE_USE_FTRACE */ =20 /* fgraph_ops callback, this processes fprobes which have exit_handler. */ static int fprobe_fgraph_entry(struct ftrace_graph_ent *trace, struct fgra= ph_ops *gops, @@ -599,7 +603,7 @@ static int fprobe_module_callback(struct notifier_block= *nb, if (alist.index > 0) { ftrace_set_filter_ips(&fprobe_graph_ops.ops, alist.addrs, alist.index, 1, 0); -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#ifdef FPROBE_USE_FTRACE ftrace_set_filter_ips(&fprobe_ftrace_ops, alist.addrs, alist.index, 1, 0); #endif --=20 2.51.1