linux-kernel - Re: [PATCH 06/18] tracing: Ftrace dynamic ftrace_event

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Date:	Thu, 27 Aug 2009 10:47:24 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Avi Kivity <avi@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Przemysław Pawełczyk 
	<przemyslaw@...elczyk.it>, Roland McGrath <roland@...hat.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: [PATCH 06/18] tracing: Ftrace dynamic ftrace_event_call support

> -int trace_define_field(struct ftrace_event_call *call, const char *type,
> -		       const char *name, int offset, int size, int is_signed,
> +int trace_define_field(struct ftrace_event_call *call, char *type,
> +		       char *name, int offset, int size, int is_signed,
>  		       int filter_type)

I don't see why you remove "const"? 

>  {
>  	struct ftrace_event_field *field;
> @@ -92,9 +92,7 @@ int trace_define_common_fields(struct ftrace_event_call *call)
>  }
>  EXPORT_SYMBOL_GPL(trace_define_common_fields);

...

>  	for (i = 0; i < meta->nb_args; i++) {
> -		ret = trace_define_field(call, meta->types[i],
> -					 meta->args[i], offset,
> +		ret = trace_define_field(call, (char *)meta->types[i],
> +					 (char *)meta->args[i], offset,

This is not good..

>  					 sizeof(unsigned long), 0,
>  					 FILTER_OTHER);
>  		offset += sizeof(unsigned long);
> @@ -277,13 +277,13 @@ void ftrace_syscall_exit(struct pt_regs *regs, long ret)
>  		trace_current_buffer_unlock_commit(event, 0, 0);
>  }

...

> -int reg_event_syscall_exit(void *ptr)
> +int reg_event_syscall_exit(struct ftrace_event_call *call)
>  {
>  	int ret = 0;
>  	int num;
>  	char *name;
>  
> -	name = (char *)ptr;
> +	name = (char *)call->data;

nitpick: implicit cast is fine.

>  	num = syscall_name_to_nr(name);
>  	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
>  		return -ENOSYS;
> @@ -342,12 +342,12 @@ int reg_event_syscall_exit(void *ptr)
>  	return ret;
>  }
>  
> -void unreg_event_syscall_exit(void *ptr)
> +void unreg_event_syscall_exit(struct ftrace_event_call *call)
>  {
>  	int num;
>  	char *name;
>  
> -	name = (char *)ptr;
> +	name = (char *)call->data;

ditto

>  	num = syscall_name_to_nr(name);
>  	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
>  		return;
--
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