include: replace linux/module.h with "struct module" wherever possible

The <linux/module.h> pretty much brings in the kitchen sink along
with it, so it should be avoided wherever reasonably possible in
terms of being included from other commonly used <linux/something.h>
files, as it results in a measureable increase on compile times.

The worst culprit was probably device.h since it is used everywhere.
This file also had an implicit dependency/usage of mutex.h which was
masked by module.h, and is also fixed here at the same time.

There are over a dozen other headers that simply declare the
struct instead of pulling in the whole file, so follow their lead
and simply make it a few more.

Most of the implicit dependencies on module.h being present by
these headers pulling it in have been now weeded out, so we can
finally make this change with hopefully minimal breakage.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

15 files changed, 23 insertions, 15 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 7fbaa91..d750a3a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -14,7 +14,6 @@
 #include <linux/wait.h>
 #include <linux/mempool.h>
 #include <linux/bio.h>
-#include <linux/module.h>
 #include <linux/stringify.h>
 #include <linux/gfp.h>
 #include <linux/bsg.h>
@@ -22,6 +21,7 @@
 
 #include <asm/scatterlist.h>
 
+struct module;
 struct scsi_ioctl_command;
 
 struct request_queue;
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index b51629e..583baf2 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -13,7 +13,6 @@
 
 #include <linux/percpu.h>
 #include <linux/list.h>
-#include <linux/module.h>
 #include <linux/kobject.h>
 #include <linux/completion.h>
 
@@ -21,6 +20,8 @@
 #define CPUIDLE_NAME_LEN	16
 #define CPUIDLE_DESC_LEN	32
 
+struct module;
+
 struct cpuidle_device;
 
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 61f29f6..8ff7dc8 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -20,7 +20,7 @@
 #include <linux/lockdep.h>
 #include <linux/compiler.h>
 #include <linux/types.h>
-#include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/pm.h>
 #include <linux/atomic.h>
 #include <asm/device.h>
@@ -29,6 +29,7 @@ struct device;
 struct device_private;
 struct device_driver;
 struct driver_private;
+struct module;
 struct class;
 struct subsys_private;
 struct bus_type;
diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index 21b3e75..1e7c011 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -1,7 +1,6 @@
 #ifndef _LINUX_FIRMWARE_H
 #define _LINUX_FIRMWARE_H
 
-#include <linux/module.h>
 #include <linux/types.h>
 #include <linux/compiler.h>
 #include <linux/gfp.h>
@@ -15,6 +14,7 @@ struct firmware {
 	struct page **pages;
 };
 
+struct module;
 struct device;
 
 struct builtin_fw {
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index f0c0e8a..26eafce 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -10,7 +10,6 @@
 #include <linux/kallsyms.h>
 #include <linux/linkage.h>
 #include <linux/bitops.h>
-#include <linux/module.h>
 #include <linux/ktime.h>
 #include <linux/sched.h>
 #include <linux/types.h>
@@ -19,6 +18,7 @@
 
 #include <asm/ftrace.h>
 
+struct module;
 struct ftrace_hash;
 
 #ifdef CONFIG_FUNCTION_TRACER
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 1be303b..a81bf6d 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -28,7 +28,6 @@
 
 #include <linux/types.h>
 #ifdef __KERNEL__
-#include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/device.h>	/* for struct device */
 #include <linux/sched.h>	/* for completion */
@@ -49,6 +48,8 @@ struct i2c_driver;
 union i2c_smbus_data;
 struct i2c_board_info;
 
+struct module;
+
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 /*
  * The master routines are the ones normally used to transmit data to devices
diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
index ca85cf8..bbd156b 100644
--- a/include/linux/ipmi.h
+++ b/include/linux/ipmi.h
@@ -220,10 +220,11 @@ struct kernel_ipmi_msg {
  * The in-kernel interface.
  */
 #include <linux/list.h>
-#include <linux/module.h>
 #include <linux/device.h>
 #include <linux/proc_fs.h>
 
+struct module;
+
 /* Opaque type for a IPMI message user.  One of these is needed to
    send and receive messages. */
 typedef struct ipmi_user *ipmi_user_t;
diff --git a/include/linux/ipmi_smi.h b/include/linux/ipmi_smi.h
index 204f9cd..3ef0d8b 100644
--- a/include/linux/ipmi_smi.h
+++ b/include/linux/ipmi_smi.h
@@ -36,7 +36,6 @@
 
 #include <linux/ipmi_msgdefs.h>
 #include <linux/proc_fs.h>
-#include <linux/module.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/ipmi.h>
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h
index 8ea9a42..0fe00cd 100644
--- a/include/linux/mdio-bitbang.h
+++ b/include/linux/mdio-bitbang.h
@@ -2,7 +2,8 @@
 #define __LINUX_MDIO_BITBANG_H
 
 #include <linux/phy.h>
-#include <linux/module.h>
+
+struct module;
 
 struct mdiobb_ctrl;
 
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 2541fb8..37be05b 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -21,7 +21,6 @@
 #define __MTD_MTD_H__
 
 #include <linux/types.h>
-#include <linux/module.h>
 #include <linux/uio.h>
 #include <linux/notifier.h>
 #include <linux/device.h>
@@ -125,6 +124,8 @@ struct nand_ecclayout {
 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
 };
 
+struct module;	/* only needed for owner field in mtd_info */
+
 struct mtd_info {
 	u_char type;
 	uint32_t flags;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 3daac2d..690276a 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -15,8 +15,8 @@
 
 #include <linux/device.h>
 #include <linux/list.h>
-#include <linux/module.h>
 
+struct module;
 struct i2c_client;
 struct spi_device;
 
diff --git a/include/linux/sunrpc/svc_xprt.h b/include/linux/sunrpc/svc_xprt.h
index 7ad9751..8620f79 100644
--- a/include/linux/sunrpc/svc_xprt.h
+++ b/include/linux/sunrpc/svc_xprt.h
@@ -8,7 +8,8 @@
 #define SUNRPC_SVC_XPRT_H
 
 #include <linux/sunrpc/svc.h>
-#include <linux/module.h>
+
+struct module;
 
 struct svc_xprt_ops {
 	struct svc_xprt	*(*xpo_create)(struct svc_serv *,
diff --git a/include/linux/textsearch.h b/include/linux/textsearch.h
index d9a85d6..cfaee86 100644
--- a/include/linux/textsearch.h
+++ b/include/linux/textsearch.h
@@ -4,10 +4,11 @@
 #include <linux/types.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/err.h>
 #include <linux/slab.h>
 
+struct module;
+
 struct ts_config;
 
 #define TS_AUTOLOAD	1 /* Automatically load textsearch modules when needed */
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 7389818..1ad4724 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -14,10 +14,10 @@
 #ifndef _UIO_DRIVER_H_
 #define _UIO_DRIVER_H_
 
-#include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/interrupt.h>
 
+struct module;
 struct uio_map;
 
 /**
diff --git a/include/linux/vlynq.h b/include/linux/vlynq.h
index 8f6a958..017d4a5 100644
--- a/include/linux/vlynq.h
+++ b/include/linux/vlynq.h
@@ -20,9 +20,10 @@
 #define __VLYNQ_H__
 
 #include <linux/device.h>
-#include <linux/module.h>
 #include <linux/types.h>
 
+struct module;
+
 #define VLYNQ_NUM_IRQS 32
 
 struct vlynq_mapping {