linux-kernel - Re: [PATCH 02/10] trace_syscalls: fix SYSCALL

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Date:	Mon, 14 Dec 2009 13:01:54 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/10] trace_syscalls: fix SYSCALL_DEFINE0

On Wed, Dec 09, 2009 at 03:15:18PM +0800, Lai Jiangshan wrote:
> 
> struct syscall_metadata variable name in SYSCALL_DEFINE0
> is not the same as SYSCALL_DEFINE1/2/3/4/5/6.
> 
> SYSCALL_TRACE_ENTER_EVENT() and SYSCALL_TRACE_EXIT_EVENT() expect
> struct syscall_metadata's name is __syscall_meta__XXXXXX
> as SYSCALL_DEFINE1/2/3/4/5/6 defines.
> 
> It causes event_enter_##sname->data points to a wrong place.
> (event_enter_##sname->data points to a dummy struct syscall_metadata)
> 
> It causes syscalls which are defined by SYSCALL_DEFINE0() can not be traced.
> 
> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 55e7108..bee1d41 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -196,7 +196,7 @@ struct perf_event_attr;
>  	static const struct syscall_metadata __used		\
>  	  __attribute__((__aligned__(4)))			\
>  	  __attribute__((section("__syscalls_metadata")))	\
> -	  __syscall_meta_##sname = {				\
> +	  __syscall_meta__##sname = {				\
>  		.name 		= "sys_"#sname,			\
>  		.nb_args 	= 0,				\
>  		.enter_event	= &event_enter__##sname,	\


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

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