linux-kernel - [tip:perf/core] tracepoints: Move struct tracepoint to new tracepoint-defs.h header

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Message-ID: <tip-bd2a634d9e852b9b6100f9ae9c3c790b0ff91ce0@git.kernel.org>
Date:	Sun, 6 Dec 2015 05:18:53 -0800
From:	tip-bot for Andi Kleen <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, eranian@...gle.com, linux-kernel@...r.kernel.org,
	vincent.weaver@...ne.edu, peterz@...radead.org, mingo@...nel.org,
	acme@...hat.com, ak@...ux.intel.com, tglx@...utronix.de,
	efault@....de, rostedt@...dmis.org, jolsa@...hat.com,
	torvalds@...ux-foundation.org
Subject: [tip:perf/core] tracepoints:
  Move struct tracepoint to new tracepoint-defs.h header

Commit-ID:  bd2a634d9e852b9b6100f9ae9c3c790b0ff91ce0
Gitweb:     http://git.kernel.org/tip/bd2a634d9e852b9b6100f9ae9c3c790b0ff91ce0
Author:     Andi Kleen <ak@...ux.intel.com>
AuthorDate: Tue, 1 Dec 2015 17:00:58 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 6 Dec 2015 12:56:06 +0100

tracepoints: Move struct tracepoint to new tracepoint-defs.h header

Steven recommended open coding access to tracepoint->key to add
trace points to headers. Unfortunately this is difficult for some
headers (such as x86 asm/msr.h) because including tracepoint.h
includes so many other headers that it causes include loops.
The main problem is the include of linux/rcupdate.h, which
pulls in a lot of other headers. The rcu header is only needed
when actually defining trace points.

Move the struct tracepoint into a separate tracepoint-defs.h
header that can be included without pulling in all of RCU.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/1449018060-1742-2-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/tracepoint-defs.h | 27 +++++++++++++++++++++++++++
 include/linux/tracepoint.h      | 16 +---------------
 2 files changed, 28 insertions(+), 15 deletions(-)

diff --git a/include/linux/tracepoint-defs.h b/include/linux/tracepoint-defs.h
new file mode 100644
index 0000000..e1ee97c
--- /dev/null
+++ b/include/linux/tracepoint-defs.h
@@ -0,0 +1,27 @@
+#ifndef TRACEPOINT_DEFS_H
+#define TRACEPOINT_DEFS_H 1
+
+/*
+ * File can be included directly by headers who only want to access
+ * tracepoint->key to guard out of line trace calls. Otherwise
+ * linux/tracepoint.h should be used.
+ */
+
+#include <linux/atomic.h>
+#include <linux/static_key.h>
+
+struct tracepoint_func {
+	void *func;
+	void *data;
+	int prio;
+};
+
+struct tracepoint {
+	const char *name;		/* Tracepoint name */
+	struct static_key key;
+	void (*regfunc)(void);
+	void (*unregfunc)(void);
+	struct tracepoint_func __rcu *funcs;
+};
+
+#endif
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 696a339c..f7c732b 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -17,26 +17,12 @@
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/rcupdate.h>
-#include <linux/static_key.h>
+#include <linux/tracepoint-defs.h>
 
 struct module;
 struct tracepoint;
 struct notifier_block;
 
-struct tracepoint_func {
-	void *func;
-	void *data;
-	int prio;
-};
-
-struct tracepoint {
-	const char *name;		/* Tracepoint name */
-	struct static_key key;
-	void (*regfunc)(void);
-	void (*unregfunc)(void);
-	struct tracepoint_func __rcu *funcs;
-};
-
 struct trace_enum_map {
 	const char		*system;
 	const char		*enum_string;
--
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