[PATCH] remove CONFIG_KOBJECT_UEVENT option

It makes zero sense to have hotplug, but not the netlink
events enabled today. Remove this option and merge the
kobject_uevent.h header into the kobject.h header file.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

MAINTAINERS

@@ -1476,12 +1476,6 @@ W:	http://nfs.sourceforge.net/
 W:	http://www.cse.unsw.edu.au/~neilb/patches/linux-devel/
 S:	Maintained
 
-KERNEL EVENT LAYER (KOBJECT_UEVENT)
-P:	Robert Love
-M:	rml@novell.com
-L:	linux-kernel@vger.kernel.org
-S:	Maintained
-
 KEXEC
 P:	Eric Biederman
 P:	Randy Dunlap

drivers/input/input.c

@@ -18,7 +18,6 @@
 #include <linux/random.h>
 #include <linux/major.h>
 #include <linux/proc_fs.h>
-#include <linux/kobject_uevent.h>
 #include <linux/interrupt.h>
 #include <linux/poll.h>
 #include <linux/device.h>

drivers/s390/crypto/z90main.c

@@ -34,7 +34,6 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
-#include <linux/kobject_uevent.h>
 #include <linux/proc_fs.h>
 #include <linux/syscalls.h>
 #include "z90crypt.h"

include/linux/kobject.h

@@ -23,15 +23,31 @@
 #include <linux/spinlock.h>
 #include <linux/rwsem.h>
 #include <linux/kref.h>
-#include <linux/kobject_uevent.h>
 #include <linux/kernel.h>
 #include <asm/atomic.h>
 
 #define KOBJ_NAME_LEN	20
 
+#define HOTPLUG_PATH_LEN	256
+
+/* path to the userspace helper executed on an event */
+extern char hotplug_path[];
+
 /* counter to tag the hotplug event, read only except for the kobject core */
 extern u64 hotplug_seqnum;
 
+/* the actions here must match the proper string in lib/kobject_uevent.c */
+typedef int __bitwise kobject_action_t;
+enum kobject_action {
+	KOBJ_ADD	= (__force kobject_action_t) 0x01,	/* add event, for hotplug */
+	KOBJ_REMOVE	= (__force kobject_action_t) 0x02,	/* remove event, for hotplug */
+	KOBJ_CHANGE	= (__force kobject_action_t) 0x03,	/* a sysfs attribute file has changed */
+	KOBJ_MOUNT	= (__force kobject_action_t) 0x04,	/* mount event for block devices */
+	KOBJ_UMOUNT	= (__force kobject_action_t) 0x05,	/* umount event for block devices */
+	KOBJ_OFFLINE	= (__force kobject_action_t) 0x06,	/* offline event for hotplug devices */
+	KOBJ_ONLINE	= (__force kobject_action_t) 0x07,	/* online event for hotplug devices */
+};
+
 struct kobject {
 	const char		* k_name;
 	char			name[KOBJ_NAME_LEN];
@@ -243,16 +259,33 @@ extern void subsys_remove_file(struct subsystem * , struct subsys_attribute *);
 
 #ifdef CONFIG_HOTPLUG
 void kobject_hotplug(struct kobject *kobj, enum kobject_action action);
+
 int add_hotplug_env_var(char **envp, int num_envp, int *cur_index,
 			char *buffer, int buffer_size, int *cur_len,
 			const char *format, ...)
 	__attribute__((format (printf, 7, 8)));
+
+int kobject_uevent(struct kobject *kobj,
+		   enum kobject_action action,
+		   struct attribute *attr);
+int kobject_uevent_atomic(struct kobject *kobj,
+			  enum kobject_action action,
+			  struct attribute *attr);
+
 #else
 static inline void kobject_hotplug(struct kobject *kobj, enum kobject_action action) { }
 static inline int add_hotplug_env_var(char **envp, int num_envp, int *cur_index, 
 				      char *buffer, int buffer_size, int *cur_len, 
 				      const char *format, ...)
 { return 0; }
+int kobject_uevent(struct kobject *kobj,
+		   enum kobject_action action,
+		   struct attribute *attr)
+{ return 0; }
+int kobject_uevent_atomic(struct kobject *kobj,
+			  enum kobject_action action,
+			  struct attribute *attr)
+{ return 0; }
 #endif
 
 #endif /* __KERNEL__ */

init/Kconfig

@@ -205,25 +205,6 @@ config HOTPLUG
 	  modules require HOTPLUG functionality, but a module built
 	  outside the kernel tree does. Such modules require Y here.
 
-config KOBJECT_UEVENT
-	bool "Kernel Userspace Events" if EMBEDDED
-	depends on NET
-	default y
-	help
-	  This option enables the kernel userspace event layer, which is a
-	  simple mechanism for kernel-to-user communication over a netlink
-	  socket.
-	  The goal of the kernel userspace events layer is to provide a simple
-	  and efficient events system, that notifies userspace about kobject
-	  state changes. This will enable applications to just listen for
-	  events instead of polling system devices and files.
-	  Hotplug events (kobject addition and removal) are also available on
-	  the netlink socket in addition to the execution of /sbin/hotplug if
-	  CONFIG_HOTPLUG is enabled.
-
-	  Say Y, unless you are building a system requiring minimal memory
-	  consumption.
-
 config IKCONFIG
 	bool "Kernel .config support"
 	---help---

kernel/sysctl.c

@@ -31,6 +31,7 @@
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/kobject.h>
 #include <linux/net.h>
 #include <linux/sysrq.h>
 #include <linux/highuid.h>
@@ -83,9 +84,6 @@ static int ngroups_max = NGROUPS_MAX;
 #ifdef CONFIG_KMOD
 extern char modprobe_path[];
 #endif
-#ifdef CONFIG_HOTPLUG
-extern char hotplug_path[];
-#endif
 #ifdef CONFIG_CHR_DEV_SG
 extern int sg_big_buff;
 #endif

lib/kobject_uevent.c

@@ -19,14 +19,17 @@
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
 #include <linux/string.h>
-#include <linux/kobject_uevent.h>
 #include <linux/kobject.h>
 #include <net/sock.h>
 
 #define BUFFER_SIZE	1024	/* buffer for the hotplug env */
 #define NUM_ENVP	32	/* number of env pointers */
 
-#if defined(CONFIG_KOBJECT_UEVENT) || defined(CONFIG_HOTPLUG)
+#if defined(CONFIG_HOTPLUG)
+char hotplug_path[HOTPLUG_PATH_LEN] = "/sbin/hotplug";
+u64 hotplug_seqnum;
+static DEFINE_SPINLOCK(sequence_lock);
+
 static char *action_to_string(enum kobject_action action)
 {
 	switch (action) {
@@ -48,9 +51,7 @@ static char *action_to_string(enum kobject_action action)
 		return NULL;
 	}
 }
-#endif
 
-#ifdef CONFIG_KOBJECT_UEVENT
 static struct sock *uevent_sock;
 
 /**
@@ -168,21 +169,6 @@ static int __init kobject_uevent_init(void)
 
 postcore_initcall(kobject_uevent_init);
 
-#else
-static inline int send_uevent(const char *signal, const char *obj,
-			      char **envp, int gfp_mask)
-{
-	return 0;
-}
-
-#endif /* CONFIG_KOBJECT_UEVENT */
-
-
-#ifdef CONFIG_HOTPLUG
-char hotplug_path[HOTPLUG_PATH_LEN] = "/sbin/hotplug";
-u64 hotplug_seqnum;
-static DEFINE_SPINLOCK(sequence_lock);
-
 /**
  * kobject_hotplug - notify userspace by executing /sbin/hotplug
  *