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diff --git a/allyesconfig.py b/allyesconfig.py
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+#!/usr/bin/env python
+
+# Works like 'make allyesconfig'. Verified by the test suite to generate output
+# identical to 'make allyesconfig', for all ARCHES.
+#
+# In theory, we need to handle choices in two different modes:
+#
+#   y: One symbol is y, the rest are n
+#   m: Any number of symbols are m, the rest are n
+#
+# Only tristate choices can be in m mode.
+#
+# Here's a convoluted example of how you might get an m-mode choice even during
+# allyesconfig:
+#
+#   choice
+#           tristate "weird choice"
+#           depends on m
+#
+#   ...
+#
+#   endchoice
+#
+#
+# Usage for the Linux kernel:
+#
+#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/allyesconfig.py
+
+import os
+import sys
+
+import kconfiglib
+
+def main():
+    if len(sys.argv) > 2:
+        sys.exit("usage: {} [Kconfig]".format(sys.argv[0]))
+
+    kconf = kconfiglib.Kconfig("Kconfig" if len(sys.argv) < 2 else sys.argv[1])
+
+    # Avoid warnings printed by Kconfiglib when assigning a value to a symbol that
+    # has no prompt. Such assignments never have an effect.
+    kconf.disable_warnings()
+
+    # Small optimization
+    BOOL_TRI = (kconfiglib.BOOL, kconfiglib.TRISTATE)
+
+    for sym in kconf.defined_syms:
+        if sym.orig_type in BOOL_TRI and not sym.choice:
+            sym.set_value(2)
+
+    # This might be slightly more robust than what the C tools do for choices,
+    # as raising one choice might allow other choices to be raised. It
+    # currently produces the same output for all ARCHes though.
+
+    while True:
+        changed = False
+
+        for choice in kconf.choices:
+            if choice.assignable and choice.tri_value < choice.assignable[-1]:
+                choice.set_value(choice.assignable[-1])
+
+                # For y-mode choices, we just let the choice get its default
+                # selection. For m-mode choices, we set all choice symbols to
+                # m.
+                if choice.tri_value == 1:
+                    for sym in choice.syms:
+                        sym.set_value(1)
+
+                changed = True
+
+        # Do multiple passes until we longer manage to raise any choices, like
+        # in allnoconfig_walk.py
+        if not changed:
+            break
+
+    kconf.write_config(".config")
+
+if __name__ == "__main__":
+    main()