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

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Date:	Tue, 15 Dec 2009 15:39:26 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/10] trace_syscalls: fix SYSCALL_DEFINE0


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








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