scripts/gdb: convert ModuleList to generator function

Analogously to the task list, convert the module list to a generator
function. It noticeably simplifies the code.

Signed-off-by: Jan Kiszka <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Jason Wessel <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ben Widawsky <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

scripts/gdb/linux/modules.py

···
 module_type = utils.CachedType("struct module")
 
 
-class ModuleList:
-    def __init__(self):
-        global module_type
-        self.module_ptr_type = module_type.get_type().pointer()
-        modules = gdb.parse_and_eval("modules")
-        self.curr_entry = modules['next']
-        self.end_of_list = modules.address
+def module_list():
+    global module_type
+    module_ptr_type = module_type.get_type().pointer()
+    modules = gdb.parse_and_eval("modules")
+    entry = modules['next']
+    end_of_list = modules.address
 
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        entry = self.curr_entry
-        if entry != self.end_of_list:
-            self.curr_entry = entry['next']
-            return utils.container_of(entry, self.module_ptr_type, "list")
-        else:
-            raise StopIteration
-
-    def next(self):
-        return self.__next__()
+    while entry != end_of_list:
+        yield utils.container_of(entry, module_ptr_type, "list")
+        entry = entry['next']
 
 
 def find_module_by_name(name):
-    for module in ModuleList():
+    for module in module_list():
         if module['name'].string() == name:
             return module
     return None
···
             "Address{0}    Module                  Size  Used by\n".format(
                 "        " if utils.get_long_type().sizeof == 8 else ""))
 
-        for module in ModuleList():
+        for module in module_list():
             ref = 0
             module_refptr = module['refptr']
             for cpu in cpus.CpuList("cpu_possible_mask"):

scripts/gdb/linux/symbols.py

···
         gdb.execute("symbol-file vmlinux")
 
         self.loaded_modules = []
-        module_list = modules.ModuleList()
+        module_list = modules.module_list()
         if not module_list:
             gdb.write("no modules found\n")
         else: