linux-kernel - [PATCH 2/4] tracing: Make syscall tracepoints conditional

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Date:	Wed, 26 Aug 2009 03:39:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Josh Stone <jistone@...hat.com>,
	Linux Arch <linux-arch@...r.kernel.org>,
	Jason Baron <jbaron@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 2/4] tracing: Make syscall tracepoints conditional

From: Josh Stone <jistone@...hat.com>

The syscall enter/exit tracepoints are only supported on archs that
HAVE_SYSCALL_TRACEPOINTS, so the declarations should be #ifdef'ed.
Also, the definition of syscall_regfunc and syscall_unregfunc should
depend on this same config, rather than the ftrace-specific one.

Signed-off-by: Josh Stone <jistone@...hat.com>
Cc: Jason Baron <jbaron@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc: Jiaying Zhang <jiayingz@...gle.com>
Cc: Martin Bligh <mbligh@...gle.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
LKML-Reference: <1251150194-1713-3-git-send-email-jistone@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 include/trace/syscall.h |    4 ++++
 kernel/tracepoint.c     |    2 +-
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 9661dd4..5dcb7e3 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -8,6 +8,8 @@
 #include <asm/ptrace.h>
 
 
+#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
+
 extern void syscall_regfunc(void);
 extern void syscall_unregfunc(void);
 
@@ -25,6 +27,8 @@ DECLARE_TRACE_WITH_CALLBACK(syscall_exit,
 	syscall_unregfunc
 );
 
+#endif
+
 /*
  * A syscall entry in the ftrace syscalls array.
  *
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index be86b9a..9e0a36f 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -576,7 +576,7 @@ __initcall(init_tracepoints);
 
 #endif /* CONFIG_MODULES */
 
-#ifdef CONFIG_FTRACE_SYSCALLS
+#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
 
 static DEFINE_MUTEX(regfunc_mutex);
 static int sys_tracepoint_refcount;
-- 
1.6.2.3

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