linux-kernel - Re: [patch 2/3] RCU move trace defines to rcupdate

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Message-ID: <20090417023802.GA26612@Krystal>
Date:	Thu, 16 Apr 2009 22:38:02 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>
Subject: Re: [patch 2/3] RCU move trace defines to rcupdate_types.h (update)

* Steven Rostedt (rostedt@...dmis.org) wrote:
> 
> On Thu, 16 Apr 2009, Jeremy Fitzhardinge wrote:
> 
> > I don't think this helps.  rcupdate_types.h uses preempt_disable/enable, but
> > doesn't include linux/preempt.h for them - but someone's going to have to, so
> > you've got an implicit dependency on the user to #include the right headers in
> > advance.
> 
> Would including linux/preempt.h in rcupdate_types.h be a problem?
> 
> -- Steve
> 

Here is the updated patch to tracepoint.h that includes preempt.h.


tracepoints : remove rcupdate.h dependency

Use the slimmer rcupdate_types.h instead of the fat rcupdate.h.

Changelog : include preempt.h from tracepoint.h.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Jeremy Fitzhardinge <jeremy@...p.org>
CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: Ingo Molnar <mingo@...e.hu>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Christoph Hellwig <hch@....de>
---
 include/linux/tracepoint.h |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Index: linux.trees.git/include/linux/tracepoint.h
===================================================================
--- linux.trees.git.orig/include/linux/tracepoint.h	2009-04-16 20:32:27.000000000 -0400
+++ linux.trees.git/include/linux/tracepoint.h	2009-04-16 22:13:53.000000000 -0400
@@ -15,7 +15,8 @@
  */
 
 #include <linux/types.h>
-#include <linux/rcupdate.h>
+#include <linux/rcupdate_types.h>
+#include <linux/preempt.h>
 
 struct module;
 struct tracepoint;
@@ -150,11 +151,11 @@ extern int tracepoint_get_iter_range(str
  * tracepoint_synchronize_unregister must be called between the last tracepoint
  * probe unregistration and the end of module exit to make sure there is no
  * caller executing a probe when it is freed.
+ * Using a define rather than a static inline to make sure tracepoint.h does not
+ * depend on rcupdate.h. rcupdate.h must be included whenever
+ * tracepoint_synchronize_unregister() is used.
  */
-static inline void tracepoint_synchronize_unregister(void)
-{
-	synchronize_sched();
-}
+#define tracepoint_synchronize_unregister() synchronize_sched()
 
 #define PARAMS(args...) args
 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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