linux-kernel - [PATCH v4 04/12] kernel: ftrace: export ftrace_sync

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Message-Id: <20250407180838.42877-4-andybnac@gmail.com>
Date: Tue,  8 Apr 2025 02:08:28 +0800
From: Andy Chiu <andybnac@...il.com>
To: linux-riscv@...ts.infradead.org,
	alexghiti@...osinc.com,
	palmer@...belt.com
Cc: Andy Chiu <andybnac@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	bjorn@...osinc.com,
	puranjay12@...il.com,
	paul.walmsley@...ive.com,
	greentime.hu@...ive.com,
	nick.hu@...ive.com,
	nylon.chen@...ive.com,
	eric.lin@...ive.com,
	vicent.chen@...ive.com,
	zong.li@...ive.com,
	yongxuan.wang@...ive.com,
	samuel.holland@...ive.com,
	olivia.chu@...ive.com,
	c2232430@...il.com
Subject: [PATCH v4 04/12] kernel: ftrace: export ftrace_sync_ipi

The following ftrace patch for riscv uses a data store to update ftrace
function. Therefore, a romote fence is required to order it against
function_trace_op updates. The mechanism is similar to the fence between
function_trace_op and update_ftrace_func in the generic ftrace, so we
leverage the same ftrace_sync_ipi function.

Signed-off-by: Andy Chiu <andybnac@...il.com>
---
 include/linux/ftrace.h | 1 +
 kernel/trace/ftrace.c  | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index fbabc3d848b3..0d4eec574707 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -807,6 +807,7 @@ extern void ftrace_call(void);
 extern void ftrace_regs_call(void);
 extern void mcount_call(void);
 
+void ftrace_sync_ipi(void *data);
 void ftrace_modify_all_code(int command);
 
 #ifndef FTRACE_ADDR
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ee662f380b61..d06bd4a046de 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -188,7 +188,7 @@ static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
 	op->saved_func(ip, parent_ip, op, fregs);
 }
 
-static void ftrace_sync_ipi(void *data)
+void ftrace_sync_ipi(void *data)
 {
 	/* Probably not needed, but do it anyway */
 	smp_rmb();
-- 
2.39.3 (Apple Git-145)