Simplify module_get_kallsym() by dropping length arg

module_get_kallsym() could in theory truncate module symbol name to fit in
buffer, but nobody does this.  Always use KSYM_NAME_LEN + 1 bytes for name.

Suggested by lg^WRusty.
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/module.h

@@ -373,7 +373,7 @@ int is_module_address(unsigned long addr);
 /* Returns module and fills in value, defined and namebuf, or NULL if
    symnum out of range. */
 struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
-				char *type, char *name, size_t namelen);
+				char *type, char *name);
 
 /* Look for this name: can be of form module:name. */
 unsigned long module_kallsyms_lookup_name(const char *name);
@@ -529,8 +529,7 @@ static inline const char *module_address_lookup(unsigned long addr,
 
 static inline struct module *module_get_kallsym(unsigned int symnum,
 						unsigned long *value,
-						char *type, char *name,
-						size_t namelen)
+						char *type, char *name)
 {
 	return NULL;
 }

kernel/kallsyms.c

@@ -312,7 +312,7 @@ static int get_ksymbol_mod(struct kallsym_iter *iter)
 {
 	iter->owner = module_get_kallsym(iter->pos - kallsyms_num_syms,
 					 &iter->value, &iter->type,
-					 iter->name, sizeof(iter->name));
+					 iter->name);
 	if (iter->owner == NULL)
 		return 0;
 

kernel/module.c

@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/moduleloader.h>
 #include <linux/init.h>
+#include <linux/kallsyms.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
@@ -2124,7 +2125,7 @@ const char *module_address_lookup(unsigned long addr,
 }
 
 struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
-				char *type, char *name, size_t namelen)
+				char *type, char *name)
 {
 	struct module *mod;
 
@@ -2134,7 +2135,7 @@ struct module *module_get_kallsym(unsigned int symnum, unsigned long *value,
 			*value = mod->symtab[symnum].st_value;
 			*type = mod->symtab[symnum].st_info;
 			strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
-				namelen);
+				KSYM_NAME_LEN + 1);
 			mutex_unlock(&module_mutex);
 			return mod;
 		}