linux-kernel - Re: [PATCH] ftrace: avoid redundant initialization in register_ftrace

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Message-Id: <20251111082033.32f65dec4f8d3ddc417b2b0b@kernel.org>
Date: Tue, 11 Nov 2025 08:20:33 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: rostedt@...dmis.org, jolsa@...hat.com, mhiramat@...nel.org,
 mark.rutland@....com, mathieu.desnoyers@...icios.com, jiang.biao@...ux.dev,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 bpf@...r.kernel.org
Subject: Re: [PATCH] ftrace: avoid redundant initialization in
 register_ftrace_direct

On Mon, 10 Nov 2025 20:18:08 +0800
Menglong Dong <menglong8.dong@...il.com> wrote:

> The FTRACE_OPS_FL_INITIALIZED flag is cleared in register_ftrace_direct,
> which can make it initialized by ftrace_ops_init() even if it is already
> initialized. It seems that there is no big deal here, but let's still fix
> it.
> 
> Fixes: f64dd4627ec6 ("ftrace: Add multi direct register/unregister interface")
> Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>

Looks good to me.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thanks,

> ---
>  kernel/trace/ftrace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 42bd2ba68a82..efb5ce32298f 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -6043,7 +6043,7 @@ int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr)
>  	new_hash = NULL;
>  
>  	ops->func = call_direct_funcs;
> -	ops->flags = MULTI_FLAGS;
> +	ops->flags |= MULTI_FLAGS;
>  	ops->trampoline = FTRACE_REGS_ADDR;
>  	ops->direct_call = addr;
>  
> -- 
> 2.51.2
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>