[RFC PATCH riscv/for-next 4/4] riscv: ftrace: do not use stop_machine to update code

From: Andy Chiu <andy.chiu@sifive.com>
To: linux-riscv@lists.infradead.org, palmer@dabbelt.com,
	mingo@redhat.com, paul.walmsley@sifive.com,
	aou@eecs.berkeley.edu, rostedt@goodmis.org
Cc: guoren@linux.alibaba.com, Andy Chiu <andy.chiu@sifive.com>,
	Greentime Hu <greentime.hu@sifive.com>,
	Zong Li <zong.li@sifive.com>
Subject: [RFC PATCH riscv/for-next 4/4] riscv: ftrace: do not use stop_machine to update code
Date: Sun, 29 May 2022 22:33:15 +0800	[thread overview]
Message-ID: <20220529143315.3678563-5-andy.chiu@sifive.com> (raw)
In-Reply-To: <20220529143315.3678563-1-andy.chiu@sifive.com>

Now it is safe to remove dependency from stop_machine() to patch code in
ftrace.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
---
 arch/riscv/kernel/ftrace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index d4bf0e5255f6..e7b8bf0a699b 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -12,6 +12,11 @@
 #include <asm/patch.h>
 
 #ifdef CONFIG_DYNAMIC_FTRACE
+void arch_ftrace_update_code(int command)
+{
+	ftrace_modify_all_code(command);
+}
+
 int ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex)
 {
 	mutex_lock(&text_mutex);
-- 
2.36.0


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