linux-kernel - Re: how to handle tracing .h loops

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Date:	Thu, 18 Aug 2011 12:57:42 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: how to handle tracing .h loops

On Thu, 2011-08-18 at 12:51 +0100, Ian Campbell wrote:
> Clearly other places are including interrupt.h and highmem.h without
> issue so what am I doing wrong here?

I guess I should have look at the .c file instead of concentrating on
the .h's because this works:

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 7b996ed..3f5ee74 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -29,6 +29,7 @@
 #include <linux/rcupdate.h>
 #include <linux/dmaengine.h>
 #include <linux/hrtimer.h>
+#include <linux/highmem.h>
 
 /* Don't change this without changing skb_csum_unnecessary! */
 #define CHECKSUM_NONE 0
diff --git a/kernel/signal.c b/kernel/signal.c
index 291c970..ff432ec 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -30,6 +30,7 @@
 #include <linux/nsproxy.h>
 #define CREATE_TRACE_POINTS
 #include <trace/events/signal.h>
+#undef CREATE_TRACE_POINTS
 
 #include <asm/param.h>
 #include <asm/uaccess.h>


But that seems odd (noone else does it). Perhaps I should instead move
that include to last in the file? i.e.:

diff --git a/kernel/signal.c b/kernel/signal.c
index 291c970..d3cd4e7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -28,8 +28,6 @@
 #include <linux/freezer.h>
 #include <linux/pid_namespace.h>
 #include <linux/nsproxy.h>
-#define CREATE_TRACE_POINTS
-#include <trace/events/signal.h>
 
 #include <asm/param.h>
 #include <asm/uaccess.h>
@@ -37,6 +35,9 @@
 #include <asm/siginfo.h>
 #include "audit.h"	/* audit_signal_info() */
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/signal.h>
+
 /*
  * SLAB caches for signal bits.
  */

Ian.

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