[PATCH RFC v2 riscv/for-next 4/5] riscv: ftrace: do not use stop_machine to update code

From: Andy Chiu <andy.chiu@sifive.com>
To: palmer@dabbelt.com, paul.walmsley@sifive.com,
	aou@eecs.berkeley.edu, rostedt@goodmis.org, mingo@redhat.com,
	peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com,
	ardb@kernel.org
Cc: greentime.hu@sifive.com, zong.li@sifive.com,
	andy.chiu@sifive.com, guoren@kernel.org, kernel@esmil.dk,
	linux-riscv@lists.infradead.org
Subject: [PATCH RFC v2 riscv/for-next 4/5] riscv: ftrace: do not use stop_machine to update code
Date: Tue, 13 Sep 2022 17:42:51 +0800	[thread overview]
Message-ID: <20220913094252.3555240-5-andy.chiu@sifive.com> (raw)
In-Reply-To: <20220913094252.3555240-1-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>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 arch/riscv/kernel/ftrace.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index 84b9e280dd1f..53db2ff83751 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -12,6 +12,12 @@
 #include <asm/patch.h>
 
 #ifdef CONFIG_DYNAMIC_FTRACE
+
+void arch_ftrace_update_code(int command)
+{
+	ftrace_modify_all_code(command);
+}
+
 void ftrace_arch_code_modify_prepare(void) __acquires(&text_mutex)
 {
 	mutex_lock(&text_mutex);
-- 
2.36.0


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