linux-kernel - Re: "[PATCH] selftests/ftrace: Correctly enable event in instance-event.tc"

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Date:   Thu, 7 Sep 2023 09:39:56 +0800
From:   Zheng Yejian <zhengyejian1@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>
CC:     <akaher@...are.com>, <linux-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>, <mhiramat@...nel.org>,
        <shuah@...nel.org>, <skhan@...uxfoundation.org>,
        <yeweihua4@...wei.com>
Subject: Re: "[PATCH] selftests/ftrace: Correctly enable event in
 instance-event.tc"

On 2023/9/7 06:46, Steven Rostedt wrote:
> On Wed, 6 Sep 2023 14:50:00 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
>> BTW, when you ran these, did you apply:
>>
>>    https://patchwork.kernel.org/project/linux-trace-kernel/patch/20230905183332.628d7cc0@gandalf.local.home/
> 
> Can you both try the above patch and this patch?
> 
> -- Steve
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c

Hi, Steve

Only apply this new patch, the kasan issue seems gone.

--

Thanks,
Zheng Yejian

> index 35783a7baf15..0827037ee3b8 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -4973,6 +4973,33 @@ int tracing_open_generic_tr(struct inode *inode, struct file *filp)
>   	return 0;
>   }
>   
> +/*
> + * The private pointer of the inode is the trace_event_file.
> + * Update the tr ref count associated to it.
> + */
> +int tracing_open_file_tr(struct inode *inode, struct file *filp)
> +{
> +	struct trace_event_file *file = inode->i_private;
> +	int ret;
> +
> +	ret = tracing_check_open_get_tr(file->tr);
> +	if (ret)
> +		return ret;
> +
> +	filp->private_data = inode->i_private;
> +
> +	return 0;
> +}
> +
> +int tracing_release_file_tr(struct inode *inode, struct file *filp)
> +{
> +	struct trace_event_file *file = inode->i_private;
> +
> +	trace_array_put(file->tr);
> +
> +	return 0;
> +}
> +
>   static int tracing_mark_open(struct inode *inode, struct file *filp)
>   {
>   	stream_open(inode, filp);
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 5669dd1f90d9..77debe53f07c 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -610,6 +610,8 @@ void tracing_reset_all_online_cpus(void);
>   void tracing_reset_all_online_cpus_unlocked(void);
>   int tracing_open_generic(struct inode *inode, struct file *filp);
>   int tracing_open_generic_tr(struct inode *inode, struct file *filp);
> +int tracing_open_file_tr(struct inode *inode, struct file *filp);
> +int tracing_release_file_tr(struct inode *inode, struct file *filp);
>   bool tracing_is_disabled(void);
>   bool tracer_tracing_is_on(struct trace_array *tr);
>   void tracer_tracing_on(struct trace_array *tr);
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index ed367d713be0..2af92177b765 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -2103,9 +2103,10 @@ static const struct file_operations ftrace_set_event_notrace_pid_fops = {
>   };
>   
>   static const struct file_operations ftrace_enable_fops = {
> -	.open = tracing_open_generic,
> +	.open = tracing_open_file_tr,
>   	.read = event_enable_read,
>   	.write = event_enable_write,
> +	.release = tracing_release_file_tr,
>   	.llseek = default_llseek,
>   };
>   
> @@ -2122,9 +2123,10 @@ static const struct file_operations ftrace_event_id_fops = {
>   };
>   
>   static const struct file_operations ftrace_event_filter_fops = {
> -	.open = tracing_open_generic,
> +	.open = tracing_open_file_tr,
>   	.read = event_filter_read,
>   	.write = event_filter_write,
> +	.release = tracing_release_file_tr,
>   	.llseek = default_llseek,
>   };
>