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Message-ID: <20091216160452.GC29609@hmsreliant.think-freely.org>
Date: Wed, 16 Dec 2009 11:04:52 -0500
From: Neil Horman <nhorman@...driver.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, fweisbec@...il.com, mingo@...hat.com,
Mathieu Desnoyers <compudj@...stal.dyndns.org>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] Fix tracing infrastructure to support multiple
includes when defining CREATE_TRACE_POINTS
Steven-
Here you go, new version of the patch, with the napi trace event fixed
up so that we don't errneously access a net_device we don't hold a ref on. I've
tested it here and its working well
Regards
Neil
Fix tracing infrastructure to allow multiple header files with TRACE_EVENTS to
be included with CREATE_TRACE_EVENTS defined
I've been workingon adding a few tracepoints to the network stack, and in so
doing it was convienient for me to add a second include file to
net/core/net-traces.c with TRACE_EVENTS defined in them. net-traces.c defines
CREATE_TRACE_EVENTS, and during the build it was failing, complaining about
duplicate definitions of __tpstrtab_<name>. I tracked down the bug to find that
define_trace.h redefined DECLARE_TRACE to be DEFINE_TRACE, so after the first
run through define_trace.h (which is included from skb.h, included in
net-trace.c first), the DECLARE_TRACE macro was left with an improper definition
to start a new cycle with the next header.
The fix I came up with was to make sure that DECLARE_TRACE was undefined at the
end of define_trace.h, and to add a conditional re-definition in tracepoint.h.
This places us back in the proper state to define a new set of tracepoints in a
subsequent header file.
Signed-off-by: Neil Horman <nhorman@...driver.com>
Acked-by: David S. Miller <davem@...emloft.net>
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index f59604e..f350688 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -58,28 +58,6 @@ struct tracepoint {
rcu_read_unlock_sched_notrace(); \
} while (0)
-/*
- * Make sure the alignment of the structure in the __tracepoints section will
- * not add unwanted padding between the beginning of the section and the
- * structure. Force alignment to the same alignment as the section start.
- */
-#define DECLARE_TRACE(name, proto, args) \
- extern struct tracepoint __tracepoint_##name; \
- static inline void trace_##name(proto) \
- { \
- if (unlikely(__tracepoint_##name.state)) \
- __DO_TRACE(&__tracepoint_##name, \
- TP_PROTO(proto), TP_ARGS(args)); \
- } \
- static inline int register_trace_##name(void (*probe)(proto)) \
- { \
- return tracepoint_probe_register(#name, (void *)probe); \
- } \
- static inline int unregister_trace_##name(void (*probe)(proto)) \
- { \
- return tracepoint_probe_unregister(#name, (void *)probe);\
- }
-
#define DEFINE_TRACE_FN(name, reg, unreg) \
static const char __tpstrtab_##name[] \
@@ -173,6 +151,29 @@ static inline void tracepoint_synchronize_unregister(void)
* trace event headers under one "CREATE_TRACE_POINTS" the first include
* will override the TRACE_EVENT and break the second include.
*/
+#if defined(CONFIG_TRACEPOINTS) && !defined(DECLARE_TRACE)
+/*
+ * Make sure the alignment of the structure in the __tracepoints section will
+ * not add unwanted padding between the beginning of the section and the
+ * structure. Force alignment to the same alignment as the section start.
+ */
+#define DECLARE_TRACE(name, proto, args) \
+ extern struct tracepoint __tracepoint_##name; \
+ static inline void trace_##name(proto) \
+ { \
+ if (unlikely(__tracepoint_##name.state)) \
+ __DO_TRACE(&__tracepoint_##name, \
+ TP_PROTO(proto), TP_ARGS(args)); \
+ } \
+ static inline int register_trace_##name(void (*probe)(proto)) \
+ { \
+ return tracepoint_probe_register(#name, (void *)probe); \
+ } \
+ static inline int unregister_trace_##name(void (*probe)(proto)) \
+ { \
+ return tracepoint_probe_unregister(#name, (void *)probe);\
+ }
+#endif
#ifndef TRACE_EVENT
/*
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index 5acfb1e..3e8cf03 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -75,6 +75,7 @@
#undef DEFINE_EVENT
#undef DEFINE_EVENT_PRINT
#undef TRACE_HEADER_MULTI_READ
+#undef DECLARE_TRACE
/* Only undef what we defined in this file */
#ifdef UNDEF_TRACE_INCLUDE_FILE
diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
index a8989c4..6afe7a8 100644
--- a/include/trace/events/napi.h
+++ b/include/trace/events/napi.h
@@ -1,11 +1,33 @@
-#ifndef _TRACE_NAPI_H_
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM napi
+
+#if !defined(_TRACE_NAPI_H_) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NAPI_H_
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
+#include <linux/ftrace.h>
+
+TRACE_EVENT(napi_poll,
-DECLARE_TRACE(napi_poll,
TP_PROTO(struct napi_struct *napi),
- TP_ARGS(napi));
+
+ TP_ARGS(napi),
+
+ TP_STRUCT__entry(
+ __field( struct napi_struct *, napi)
+ __string( dev_name, napi->dev->name)
+ ),
+
+ TP_fast_assign(
+ __entry->napi = napi;
+ __assign_str(dev_name, napi->dev->name);
+ ),
+
+ TP_printk("napi poll on napi struct %p for device %s",
+ __entry->napi, __get_str(dev_name))
+);
#endif
+
+#include <trace/define_trace.h>
--
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