From 5cc4c1f83f1050cb47ea7e7bbc90ff35ef411e8a Mon Sep 17 00:00:00 2001
From: Ian Abbott <abbotti@mev.co.uk>
Date: Mon, 20 Feb 2012 17:41:50 +0000
Subject: [PATCH] Use 'bool' type for 'bool' module parameters, if supported.

In the compatibility header for linux/moduleparam.h, define a
type COMEDI_MODULE_PARAM_BOOL_T to be used for 'bool' module parameters.

For kernel versions before 2.6.31, make it an 'int'.

For kernel versions 2.6.31 onwards, make it a 'bool'.  Support for bool
module parameters of type 'int' or 'unsigned int' is going away in
kernel version 3.4.  In kernel version 3.3 it produces a warning.

The only bool module parameter we currently have is 'comedi_autoconfig'.

Moved the #include "comedi_fops.h" after the #include
<linux/moduleparam.h> to get it to compile.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
 comedi/comedi_fops.c        |  8 ++++----
 comedi/comedi_fops.h        |  2 +-
 comedi/drivers.c            |  3 ++-
 include/linux/moduleparam.h | 13 +++++++++++++
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/comedi/comedi_fops.c b/comedi/comedi_fops.c
index 5437712d..53d6acaf 100644
--- a/comedi/comedi_fops.c
+++ b/comedi/comedi_fops.c
@@ -24,9 +24,6 @@
 #undef DEBUG
 
 #define __NO_VERSION__
-#include "comedi_fops.h"
-#include "comedi_compat32.h"
-
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -49,6 +46,9 @@
 #include <asm/io.h>
 #include <asm/uaccess.h>
 
+#include "comedi_fops.h"
+#include "comedi_compat32.h"
+
 //#include "kvmem.h"
 
 MODULE_AUTHOR("http://www.comedi.org");
@@ -60,7 +60,7 @@ int comedi_debug;
 module_param(comedi_debug, int, 0644);
 #endif
 
-int comedi_autoconfig = 1;
+COMEDI_MODULE_PARAM_BOOL_T comedi_autoconfig = 1;
 module_param(comedi_autoconfig, bool, 0444);
 
 int comedi_num_legacy_minors = 0;
diff --git a/comedi/comedi_fops.h b/comedi/comedi_fops.h
index ef7c5cc3..d6ac451e 100644
--- a/comedi/comedi_fops.h
+++ b/comedi/comedi_fops.h
@@ -4,6 +4,6 @@
 
 extern struct class *comedi_class;
 extern const struct file_operations comedi_fops;
-extern int comedi_autoconfig;
+extern COMEDI_MODULE_PARAM_BOOL_T comedi_autoconfig;
 
 #endif //_COMEDI_FOPS_H
diff --git a/comedi/drivers.c b/comedi/drivers.c
index 33042672..4eed3671 100644
--- a/comedi/drivers.c
+++ b/comedi/drivers.c
@@ -24,7 +24,6 @@
 #define _GNU_SOURCE
 
 #define __NO_VERSION__
-#include "comedi_fops.h"
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -47,6 +46,8 @@
 #include <asm/io.h>
 #include <asm/system.h>
 
+#include "comedi_fops.h"
+
 static int postconfig(comedi_device * dev);
 static int insn_rw_emulate_bits(comedi_device * dev, comedi_subdevice * s,
 	comedi_insn * insn, lsampl_t * data);
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index e80d8d29..391c04a7 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -100,4 +100,17 @@
 	MODULE_PARM(name, "1-" __MODULE_STRING(len) _MODULE_PARM_STRING_##type)
 #endif /* module_param_array */
 
+/*
+ * Define a type for 'bool' parameters....
+ */
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31))
+/* Need to use 'int' or 'unsigned int' for 'bool' module parameter. */
+typedef int COMEDI_MODULE_PARAM_BOOL_T;
+#else
+/* Can use 'int', 'unsigned int' or 'bool' for 'bool' module parameter, but
+ * only 'bool' will be allowed for kernel version 3.4 onwards.  Using 'int'
+ * or 'unsigned int' results in a warning for kernel version 3.3. */
+typedef bool COMEDI_MODULE_PARAM_BOOL_T;
+#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)) */
+
 #endif /* _COMPAT_MODULEPARAM_H */
-- 
2.26.2