[kobject] Support unlimited name lengths.

Add ->k_name pointer which points to the name for a kobject. By default, this
points to ->name (the static name array). 
 
Users of kobjects may use the helper function kobject_set_name() (and are 
encouraged to do so in all cases). This function will determined whether or
not the name is short enough to fit in ->name. If so, great. 

Otherwise, a dyanamic string is allocated and the name is stored there. 
->k_name will point to that, and will be freed when the kobject is released. 

kobject_set_name() may take a format string, like:

	kobject_set_name(kobj,"%s%d",base_name,id); 

and will behave as expected (will put in ->name, unless it's too long, in 
which case a new string will be allocated and it will be stored in there). 

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index e744a55d07d5..42174b623637 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -24,6 +24,7 @@
 #define KOBJ_NAME_LEN	20
 
 struct kobject {
+	char			* k_name;
 	char			name[KOBJ_NAME_LEN];
 	atomic_t		refcount;
 	struct list_head	entry;
@@ -33,6 +34,14 @@ struct kobject {
 	struct dentry		* dentry;
 };
 
+extern int kobject_set_name(struct kobject *, const char *, ...)
+	__attribute__((format(printf,2,3)));
+
+static inline char * kobject_name(struct kobject * kobj)
+{
+	return kobj->k_name;
+}
+
 extern void kobject_init(struct kobject *);
 extern void kobject_cleanup(struct kobject *);