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: NJan Kiszka <jan.kiszka@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/gdb/linux/modules.py

@@ -19,31 +19,20 @@ from linux import cpus, utils
 module_type = utils.CachedType("struct module")
 
 
-class ModuleList:
-    def __init__(self):
+def module_list():
     global module_type
-        self.module_ptr_type = module_type.get_type().pointer()
+    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 __iter__(self):
-        return self
+    entry = modules['next']
+    end_of_list = modules.address
 
-    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
@@ -83,7 +72,7 @@ class LxLsmod(gdb.Command):
             "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

@@ -133,7 +133,7 @@ lx-symbols command."""
         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: