linux-kernel - Re: [PATCH 1/3][RESEND] function-graph: use ftrace_graph

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Date:	Fri, 18 Sep 2009 17:03:41 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3][RESEND] function-graph: use ftrace_graph_funcs
	directly

On Fri, Sep 18, 2009 at 02:06:28PM +0800, Li Zefan wrote:
> No need to store ftrace_graph_funcs in file->private.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>


Acked-by: Frederic Weisbecker <fweisbec@...il.com>


> ---
> 
> The first 2 patches were sent 2 month ago..
> 
> ---
>  kernel/trace/ftrace.c |   23 ++++-------------------
>  1 files changed, 4 insertions(+), 19 deletions(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index cc615f8..c71e91b 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -2414,11 +2414,9 @@ unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS] __read_mostly;
>  static void *
>  __g_next(struct seq_file *m, loff_t *pos)
>  {
> -	unsigned long *array = m->private;
> -
>  	if (*pos >= ftrace_graph_count)
>  		return NULL;
> -	return &array[*pos];
> +	return &ftrace_graph_funcs[*pos];
>  }
>  
>  static void *
> @@ -2482,16 +2480,10 @@ ftrace_graph_open(struct inode *inode, struct file *file)
>  		ftrace_graph_count = 0;
>  		memset(ftrace_graph_funcs, 0, sizeof(ftrace_graph_funcs));
>  	}
> +	mutex_unlock(&graph_lock);
>  
> -	if (file->f_mode & FMODE_READ) {
> +	if (file->f_mode & FMODE_READ)
>  		ret = seq_open(file, &ftrace_graph_seq_ops);
> -		if (!ret) {
> -			struct seq_file *m = file->private_data;
> -			m->private = ftrace_graph_funcs;
> -		}
> -	} else
> -		file->private_data = ftrace_graph_funcs;
> -	mutex_unlock(&graph_lock);
>  
>  	return ret;
>  }
> @@ -2560,7 +2552,6 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
>  		   size_t cnt, loff_t *ppos)
>  {
>  	struct trace_parser parser;
> -	unsigned long *array;
>  	size_t read = 0;
>  	ssize_t ret;
>  
> @@ -2574,12 +2565,6 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
>  		goto out;
>  	}
>  
> -	if (file->f_mode & FMODE_READ) {
> -		struct seq_file *m = file->private_data;
> -		array = m->private;
> -	} else
> -		array = file->private_data;
> -
>  	if (trace_parser_get_init(&parser, FTRACE_BUFF_MAX)) {
>  		ret = -ENOMEM;
>  		goto out;
> @@ -2591,7 +2576,7 @@ ftrace_graph_write(struct file *file, const char __user *ubuf,
>  		parser.buffer[parser.idx] = 0;
>  
>  		/* we allow only one expression at a time */
> -		ret = ftrace_set_func(array, &ftrace_graph_count,
> +		ret = ftrace_set_func(ftrace_graph_funcs, &ftrace_graph_count,
>  					parser.buffer);
>  		if (ret)
>  			goto out;
> -- 
> 1.6.3
> 

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