tools: moveconfig: warn loudly if moved option has no entry in Kconfig

Currently, the tool gives up moving an option quietly if its entry
was not found in Kconfig.

If the option is not defined in the config header in the first
place, it is no problem (as the Kconfig entry may have been hidden
by reasonable "depends on").

However, if the option is defined in the config header, the missing
Kconfig entry is a sign of possible behavior change.  It is highly
recommended to manually check if the option has been moved as
expected.  In this case, let's add "suspicious" in the log and
change the log color (if --color option is given) to make it stand
out.

This was suggested by Tom in [1].

[1] http://lists.denx.de/pipermail/u-boot/2016-July/261988.html

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Suggested-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

tools/moveconfig.py

@@ -47,12 +47,18 @@ It looks like one of the following:
    This config option was moved to the defconfig
 
  - CONFIG_... is not defined in Kconfig.  Do nothing.
-   The entry for this CONFIG was not found in Kconfig.
+   The entry for this CONFIG was not found in Kconfig.  The option is not
+   defined in the config header, either.  So, this case can be just skipped.
+
+ - CONFIG_... is not defined in Kconfig (suspicious).  Do nothing.
+   This option is defined in the config header, but its entry was not found
+   in Kconfig.
    There are two common cases:
      - You forgot to create an entry for the CONFIG before running
        this tool, or made a typo in a CONFIG passed to this tool.
      - The entry was hidden due to unmet 'depends on'.
-       This is correct behavior.
+   The tool does not know if the result is reasonable, so please check it
+   manually.
 
  - 'CONFIG_...' is the same as the define in Kconfig.  Do nothing.
    The define in the config header matched the one in Kconfig.
@@ -210,7 +216,8 @@ STATE_SAVEDEFCONFIG = 3
 
 ACTION_MOVE = 0
 ACTION_NO_ENTRY = 1
-ACTION_NO_CHANGE = 2
+ACTION_NO_ENTRY_WARN = 2
+ACTION_NO_CHANGE = 3
 
 COLOR_BLACK        = '0;30'
 COLOR_RED          = '0;31'
@@ -659,14 +666,6 @@ class KconfigParser:
         """
         not_set = '# %s is not set' % config
 
-        for line in dotconfig_lines:
-            line = line.rstrip()
-            if line.startswith(config + '=') or line == not_set:
-                old_val = line
-                break
-        else:
-            return (ACTION_NO_ENTRY, config)
-
         for line in autoconf_lines:
             line = line.rstrip()
             if line.startswith(config + '='):
@@ -675,6 +674,17 @@ class KconfigParser:
         else:
             new_val = not_set
 
+        for line in dotconfig_lines:
+            line = line.rstrip()
+            if line.startswith(config + '=') or line == not_set:
+                old_val = line
+                break
+        else:
+            if new_val == not_set:
+                return (ACTION_NO_ENTRY, config)
+            else:
+                return (ACTION_NO_ENTRY_WARN, config)
+
         # If this CONFIG is neither bool nor trisate
         if old_val[-2:] != '=y' and old_val[-2:] != '=m' and old_val != not_set:
             # tools/scripts/define2mk.sed changes '1' to 'y'.
@@ -704,6 +714,7 @@ class KconfigParser:
 
         results = []
         updated = False
+        suspicious = False
 
         with open(self.dotconfig) as f:
             dotconfig_lines = f.readlines()
@@ -725,6 +736,10 @@ class KconfigParser:
             elif action == ACTION_NO_ENTRY:
                 actlog = "%s is not defined in Kconfig.  Do nothing." % value
                 log_color = COLOR_LIGHT_BLUE
+            elif action == ACTION_NO_ENTRY_WARN:
+                actlog = "%s is not defined in Kconfig (suspicious).  Do nothing." % value
+                log_color = COLOR_YELLOW
+                suspicious = True
             elif action == ACTION_NO_CHANGE:
                 actlog = "'%s' is the same as the define in Kconfig.  Do nothing." \
                          % value
@@ -744,7 +759,7 @@ class KconfigParser:
         os.remove(self.config_autoconf)
         os.remove(self.autoconf)
 
-        return (updated, log)
+        return (updated, suspicious, log)
 
     def check_defconfig(self):
         """Check the defconfig after savedefconfig
@@ -923,7 +938,9 @@ class Slot:
     def do_savedefconfig(self):
         """Update the .config and run 'make savedefconfig'."""
 
-        (updated, log) = self.parser.update_dotconfig()
+        (updated, suspicious, log) = self.parser.update_dotconfig()
+        if suspicious:
+            self.suspicious_boards.add(self.defconfig)
         self.log += log
 
         if not self.options.force_sync and not updated:
@@ -994,7 +1011,7 @@ class Slot:
     def get_suspicious_boards(self):
         """Returns a set of boards (defconfigs) with possible misconversion.
         """
-        return self.suspicious_boards
+        return self.suspicious_boards - self.failed_boards
 
 class Slots: