linux-kernel - Re: [PATCH v2 2/5] ftrace: Do not add duplicate entries in subops manager ops

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Message-Id: <20250220155944.821ccc0cd98594b924c2752e@kernel.org>
Date: Thu, 20 Feb 2025 15:59:44 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Heiko Carstens <hca@...ux.ibm.com>, Sven
 Schnelle <svens@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/5] ftrace: Do not add duplicate entries in subops
 manager ops

On Wed, 19 Feb 2025 17:04:38 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Steven Rostedt <rostedt@...dmis.org>
> 
> Check if a function is already in the manager ops of a subops. A manager
> ops contains multiple subops, and if two or more subops are tracing the
> same function, the manager ops only needs a single entry in its hash.
> 
> Cc: stable@...r.kernel.org
> Fixes: 4f554e955614f ("ftrace: Add ftrace_set_filter_ips function")
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Looks good to me.

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

Thank you,

> ---
>  kernel/trace/ftrace.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 03b35a05808c..189eb0a12f4b 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -5717,6 +5717,9 @@ __ftrace_match_addr(struct ftrace_hash *hash, unsigned long ip, int remove)
>  			return -ENOENT;
>  		free_hash_entry(hash, entry);
>  		return 0;
> +	} else if (__ftrace_lookup_ip(hash, ip) != NULL) {
> +		/* Already exists */
> +		return 0;
>  	}
>  
>  	entry = add_hash_entry(hash, ip);
> -- 
> 2.47.2
> 
> 


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