linux-kernel - Re: [PATCH v2 3/7] tracing: Use _

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Message-Id: <20250107202236.6fbb4ad2a93e18f2db8e862f@kernel.org>
Date: Tue, 7 Jan 2025 20:22:36 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra
 <peterz@...radead.org>, Anil S Keshavamurthy
 <anil.s.keshavamurthy@...el.com>, "David S . Miller" <davem@...emloft.net>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Oleg Nesterov
 <oleg@...hat.com>, Tzvetomir Stoyanov <tz.stoyanov@...il.com>, Naveen N Rao
 <naveen@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, Jason Baron
 <jbaron@...mai.com>, Ard Biesheuvel <ardb@...nel.org>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] tracing: Use __free() for argv in dynevent

On Tue,  7 Jan 2025 01:03:27 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Use __free() for the args allocated by argv_split() in dynevent.

Lol, the same one has already done by Steve.

https://lore.kernel.org/linux-trace-kernel/20241220103313.4a74ec8e@gandalf.local.home/

Let me drop it.

> 
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---
>  Changes in v3:
>   - Rename to __free(argv_free).
>  Changes in v2:
>   - Rebased on probes/for-next, which reverts previous dynevent guard patch.
> ---
>  kernel/trace/trace_dynevent.c |   23 ++++++++---------------
>  1 file changed, 8 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index 4376887e0d8a..78242ea6fb30 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c
> @@ -74,24 +74,20 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
>  	struct dyn_event *pos, *n;
>  	char *system = NULL, *event, *p;
>  	int argc, ret = -ENOENT;
> -	char **argv;
> +	char **argv __free(argv_free) = NULL;
>  
>  	argv = argv_split(GFP_KERNEL, raw_command, &argc);
>  	if (!argv)
>  		return -ENOMEM;
>  
>  	if (argv[0][0] == '-') {
> -		if (argv[0][1] != ':') {
> -			ret = -EINVAL;
> -			goto out;
> -		}
> +		if (argv[0][1] != ':')
> +			return -EINVAL;
>  		event = &argv[0][2];
>  	} else {
>  		event = strchr(argv[0], ':');
> -		if (!event) {
> -			ret = -EINVAL;
> -			goto out;
> -		}
> +		if (!event)
> +			return -EINVAL;
>  		event++;
>  	}
>  
> @@ -101,10 +97,8 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
>  		event = p + 1;
>  		*p = '\0';
>  	}
> -	if (!system && event[0] == '\0') {
> -		ret = -EINVAL;
> -		goto out;
> -	}
> +	if (!system && event[0] == '\0')
> +		return -EINVAL;
>  
>  	mutex_lock(&event_mutex);
>  	for_each_dyn_event_safe(pos, n) {
> @@ -120,8 +114,7 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
>  	}
>  	tracing_reset_all_online_cpus();
>  	mutex_unlock(&event_mutex);
> -out:
> -	argv_free(argv);
> +
>  	return ret;
>  }
>  
> 


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