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

[Steven Rostedt]

On Sun, 29 May 2022 22:33:15 +0800
Andy Chiu <andy.chiu at sifive.com> wrote:

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

I wasn't able to test it, and I don't know the intrinsic details of
risc-v, but from the change logs and looking at the code from what I
could understand, it all seems reasonable to me.

For the entire patch set:

Acked-by: Steven Rostedt (Google) <rostedt at goodmis.org>

-- Steve


> Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
> Reviewed-by: Greentime Hu <greentime.hu at sifive.com>
> Reviewed-by: Zong Li <zong.li at 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);