linux-kernel - Re: [PATCH v5 3.1.0-rc4-tip 19/26] tracing: Extract out common code for kprobes/uprobes traceevents.

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Date:	Wed, 28 Sep 2011 14:04:05 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jonathan Corbet <corbet@....net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v5 3.1.0-rc4-tip 19/26]   tracing: Extract out common
 code for kprobes/uprobes traceevents.

(2011/09/20 21:03), Srikar Dronamraju wrote:
> Move parts of trace_kprobe.c that can be shared with upcoming
> trace_uprobe.c. Common code to kernel/trace/trace_probe.h and
> kernel/trace/trace_probe.c.

This seems including different changes (as below). Please separate it.
(Maybe "Use Boolean instead of integer" patch? :))

[...]
> @@ -651,7 +107,7 @@ static struct trace_probe *alloc_trace_probe(const char *group,
>  					     void *addr,
>  					     const char *symbol,
>  					     unsigned long offs,
> -					     int nargs, int is_return)
> +					     int nargs, bool is_return)
>  {
>  	struct trace_probe *tp;
>  	int ret = -ENOMEM;
[...]

> @@ -1153,7 +366,7 @@ static int create_trace_probe(int argc, char **argv)
>  	 */
>  	struct trace_probe *tp;
>  	int i, ret = 0;
> -	int is_return = 0, is_delete = 0;
> +	bool is_return = false, is_delete = false;
>  	char *symbol = NULL, *event = NULL, *group = NULL;
>  	char *arg;
>  	unsigned long offset = 0;
> @@ -1162,11 +375,11 @@ static int create_trace_probe(int argc, char **argv)
>  
>  	/* argc must be >= 1 */
>  	if (argv[0][0] == 'p')
> -		is_return = 0;
> +		is_return = false;
>  	else if (argv[0][0] == 'r')
> -		is_return = 1;
> +		is_return = true;
>  	else if (argv[0][0] == '-')
> -		is_delete = 1;
> +		is_delete = true;
>  	else {
>  		pr_info("Probe definition must be started with 'p', 'r' or"
>  			" '-'.\n");

And also, this has bugs in selftest code.

[...]
> @@ -2020,7 +1166,7 @@ static __init int kprobe_trace_self_tests_init(void)
>  
>  	pr_info("Testing kprobe tracing: ");
>  
> -	ret = command_trace_probe("p:testprobe kprobe_trace_selftest_target "
> +	ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target "
>  				  "$stack $stack0 +0($stack)");
>  	if (WARN_ON_ONCE(ret)) {
>  		pr_warning("error on probing function entry.\n");
> @@ -2035,7 +1181,7 @@ static __init int kprobe_trace_self_tests_init(void)
>  			enable_trace_probe(tp, TP_FLAG_TRACE);
>  	}
>  
> -	ret = command_trace_probe("r:testprobe2 kprobe_trace_selftest_target "
> +	ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target "
>  				  "$retval");
>  	if (WARN_ON_ONCE(ret)) {
>  		pr_warning("error on probing function return.\n");
> @@ -2055,13 +1201,13 @@ static __init int kprobe_trace_self_tests_init(void)
>  
>  	ret = target(1, 2, 3, 4, 5, 6);
>  
> -	ret = command_trace_probe("-:testprobe");
> +	ret = traceprobe_command_trace_probe("-:testprobe");
>  	if (WARN_ON_ONCE(ret)) {
>  		pr_warning("error on deleting a probe.\n");
>  		warn++;
>  	}
>  
> -	ret = command_trace_probe("-:testprobe2");
> +	ret = traceprobe_command_trace_probe("-:testprobe2");
>  	if (WARN_ON_ONCE(ret)) {
>  		pr_warning("error on deleting a probe.\n");
>  		warn++;

traceprobe_command(str) and traceprobe_command_trace_probe(str) should be
traceprobe_command(str, create_trace_probe).

Thank you,


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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