linux-kernel - Re: [PATCH 6/6] uprobes/tracing: Change create_trace

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Date:	Sun, 7 Apr 2013 19:47:24 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Anton Arapov <anton@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] uprobes/tracing: Change create_trace_uprobe() to
 support uretprobes

* Oleg Nesterov <oleg@...hat.com> [2013-04-01 18:09:00]:

> Finally change create_trace_uprobe() to check if argv[0][0] == 'r'
> and pass the correct "is_ret" to alloc_trace_uprobe().
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

> ---
>  kernel/trace/trace_uprobe.c |   11 +++++++----
>  1 files changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 1b3622a..2773d2a 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -200,7 +200,7 @@ end:
> 
>  /*
>   * Argument syntax:
> - *  - Add uprobe: p[:[GRP/]EVENT] PATH:SYMBOL[+offs] [FETCHARGS]
> + *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:SYMBOL [FETCHARGS]
>   *
>   *  - Remove uprobe: -:[GRP/]EVENT
>   */
> @@ -212,20 +212,23 @@ static int create_trace_uprobe(int argc, char **argv)
>  	char buf[MAX_EVENT_NAME_LEN];
>  	struct path path;
>  	unsigned long offset;
> -	bool is_delete;
> +	bool is_delete, is_return;
>  	int i, ret;
> 
>  	inode = NULL;
>  	ret = 0;
>  	is_delete = false;
> +	is_return = false;
>  	event = NULL;
>  	group = NULL;
> 
>  	/* argc must be >= 1 */
>  	if (argv[0][0] == '-')
>  		is_delete = true;
> +	else if (argv[0][0] == 'r')
> +		is_return = true;
>  	else if (argv[0][0] != 'p') {
> -		pr_info("Probe definition must be started with 'p' or '-'.\n");
> +		pr_info("Probe definition must be started with 'p', 'r' or '-'.\n");
>  		return -EINVAL;
>  	}
> 
> @@ -323,7 +326,7 @@ static int create_trace_uprobe(int argc, char **argv)
>  		kfree(tail);
>  	}
> 
> -	tu = alloc_trace_uprobe(group, event, argc, false);
> +	tu = alloc_trace_uprobe(group, event, argc, is_return);
>  	if (IS_ERR(tu)) {
>  		pr_info("Failed to allocate trace_uprobe.(%d)\n", (int)PTR_ERR(tu));
>  		ret = PTR_ERR(tu);
> -- 
> 1.5.5.1
> 

-- 
Thanks and Regards
Srikar Dronamraju

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