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Date: Sun, 21 Aug 2016 12:19:24 +0530
From: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
To: linux@...linux.org.uk, realmz6@...il.com, jdike@...toit.com,
richard@....at, marcel@...tmann.org, gustavo@...ovan.org,
johan.hedberg@...il.com, arnd@...db.de, gregkh@...uxfoundation.org,
dh.herrmann@...glemail.com, jikos@...nel.org,
benjamin.tissoires@...hat.com, dmitry.torokhov@...il.com,
mb@...htnvm.io, schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
mst@...hat.com, elias.vds@...il.com, akpm@...ux-foundation.org,
jcliang@...omium.org, holzheu@...ux.vnet.ibm.com,
linux-kernel@...r.kernel.org
Cc: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
Subject: [PATCH 1/2] drivercore: Add helper macro for misc device boilerplate
For modules that call misc_register and misc_deregister in its module
init and exit methods without any additional code ends up being
boilerplate. This patch adds helper macro module_misc_device(), that
replaces module_init()/ module_exit() with template functions.
This patch also converts drivers to use new macro.
Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
---
arch/arm/common/bL_switcher_dummy_if.c | 14 +-------------
arch/blackfin/mach-bf561/coreb.c | 13 +------------
drivers/hid/uhid.c | 13 +------------
drivers/input/misc/uinput.c | 15 ++-------------
drivers/s390/char/sclp_ctl.c | 19 +------------------
drivers/vhost/test.c | 13 +------------
include/linux/miscdevice.h | 7 +++++++
7 files changed, 14 insertions(+), 80 deletions(-)
diff --git a/arch/arm/common/bL_switcher_dummy_if.c b/arch/arm/common/bL_switcher_dummy_if.c
index 3f47f12..6053f64 100644
--- a/arch/arm/common/bL_switcher_dummy_if.c
+++ b/arch/arm/common/bL_switcher_dummy_if.c
@@ -56,16 +56,4 @@ static struct miscdevice bL_switcher_device = {
"b.L_switcher",
&bL_switcher_fops
};
-
-static int __init bL_switcher_dummy_if_init(void)
-{
- return misc_register(&bL_switcher_device);
-}
-
-static void __exit bL_switcher_dummy_if_exit(void)
-{
- misc_deregister(&bL_switcher_device);
-}
-
-module_init(bL_switcher_dummy_if_init);
-module_exit(bL_switcher_dummy_if_exit);
+module_misc_device(bL_switcher_device);
diff --git a/arch/blackfin/mach-bf561/coreb.c b/arch/blackfin/mach-bf561/coreb.c
index 78ecb50..8a2543c 100644
--- a/arch/blackfin/mach-bf561/coreb.c
+++ b/arch/blackfin/mach-bf561/coreb.c
@@ -59,18 +59,7 @@ static struct miscdevice coreb_dev = {
.name = "coreb",
.fops = &coreb_fops,
};
-
-static int __init bf561_coreb_init(void)
-{
- return misc_register(&coreb_dev);
-}
-module_init(bf561_coreb_init);
-
-static void __exit bf561_coreb_exit(void)
-{
- misc_deregister(&coreb_dev);
-}
-module_exit(bf561_coreb_exit);
+module_misc_device(coreb_dev);
MODULE_AUTHOR("Bas Vermeulen <bvermeul@...ckstar.xs4all.nl>");
MODULE_DESCRIPTION("BF561 Core B Support");
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 99ec3ff..7f8ff39 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -779,19 +779,8 @@ static struct miscdevice uhid_misc = {
.minor = UHID_MINOR,
.name = UHID_NAME,
};
+module_misc_device(uhid_misc);
-static int __init uhid_init(void)
-{
- return misc_register(&uhid_misc);
-}
-
-static void __exit uhid_exit(void)
-{
- misc_deregister(&uhid_misc);
-}
-
-module_init(uhid_init);
-module_exit(uhid_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Herrmann <dh.herrmann@...il.com>");
MODULE_DESCRIPTION("User-space I/O driver support for HID subsystem");
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 65ebbd1..92595b9 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -1013,23 +1013,12 @@ static struct miscdevice uinput_misc = {
.minor = UINPUT_MINOR,
.name = UINPUT_NAME,
};
+module_misc_device(uinput_misc);
+
MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
MODULE_ALIAS("devname:" UINPUT_NAME);
-static int __init uinput_init(void)
-{
- return misc_register(&uinput_misc);
-}
-
-static void __exit uinput_exit(void)
-{
- misc_deregister(&uinput_misc);
-}
-
MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
MODULE_DESCRIPTION("User level driver support for input subsystem");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.3");
-
-module_init(uinput_init);
-module_exit(uinput_exit);
diff --git a/drivers/s390/char/sclp_ctl.c b/drivers/s390/char/sclp_ctl.c
index ea607a4..554eaa1 100644
--- a/drivers/s390/char/sclp_ctl.c
+++ b/drivers/s390/char/sclp_ctl.c
@@ -126,21 +126,4 @@ static struct miscdevice sclp_ctl_device = {
.name = "sclp",
.fops = &sclp_ctl_fops,
};
-
-/*
- * Register sclp_ctl misc device
- */
-static int __init sclp_ctl_init(void)
-{
- return misc_register(&sclp_ctl_device);
-}
-module_init(sclp_ctl_init);
-
-/*
- * Deregister sclp_ctl misc device
- */
-static void __exit sclp_ctl_exit(void)
-{
- misc_deregister(&sclp_ctl_device);
-}
-module_exit(sclp_ctl_exit);
+module_misc_device(sclp_ctl_device);
diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index 97fb2f8..3cc98c0 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -322,18 +322,7 @@ static struct miscdevice vhost_test_misc = {
"vhost-test",
&vhost_test_fops,
};
-
-static int vhost_test_init(void)
-{
- return misc_register(&vhost_test_misc);
-}
-module_init(vhost_test_init);
-
-static void vhost_test_exit(void)
-{
- misc_deregister(&vhost_test_misc);
-}
-module_exit(vhost_test_exit);
+module_misc_device(vhost_test_misc);
MODULE_VERSION("0.0.1");
MODULE_LICENSE("GPL v2");
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 5430374..9f32990 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -70,6 +70,13 @@ struct miscdevice {
extern int misc_register(struct miscdevice *misc);
extern void misc_deregister(struct miscdevice *misc);
+/*
+ * Helper macro for drivers that don't do anything special in module init / exit
+ * call. This helps in eleminating of boilerplate code.
+ */
+#define module_misc_device(__misc_device) \
+ module_driver(__misc_device, misc_register, misc_deregister)
+
#define MODULE_ALIAS_MISCDEV(minor) \
MODULE_ALIAS("char-major-" __stringify(MISC_MAJOR) \
"-" __stringify(minor))
--
2.5.0
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