Add an allmodconfig implementation

Verified to produce identical output to 'make allmodconfig', for all
arches.

Will be packaged.

2 files changed, 58 insertions, 1 deletions

diff --git a/allmodconfig.py b/allmodconfig.py
new file mode 100755
index 0000000..3f049a8
--- /dev/null
+++ b/allmodconfig.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+# Works like 'make allmodconfig'. Verified by the test suite to generate output
+# identical to 'make allmodconfig', for all ARCHES.
+#
+# Usage for the Linux kernel:
+#
+#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/allyesconfig.py
+
+import kconfiglib
+
+def main():
+    kconf = kconfiglib.standard_kconfig()
+
+    # 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 optimizations
+    BOOL = kconfiglib.BOOL
+    TRISTATE = kconfiglib.TRISTATE
+
+    for sym in kconf.defined_syms:
+        if sym.orig_type == BOOL:
+            # 'bool' choice symbols get their default value, as determined by
+            # e.g. 'default's on the choice
+            if not sym.choice:
+                # All other bool symbols get set to 'y', like for allyesconfig
+                sym.set_value(2)
+        elif sym.orig_type == TRISTATE:
+            sym.set_value(1)
+
+    for choice in kconf.choices:
+        choice.set_value(2 if choice.orig_type == BOOL else 1)
+
+    kconf.write_config(kconfiglib.standard_config_filename())
+
+if __name__ == "__main__":
+    main()
diff --git a/testsuite.py b/testsuite.py
index b5644d2..2a8588a 100644
--- a/testsuite.py
+++ b/testsuite.py
@@ -1917,7 +1917,8 @@ def run_compatibility_tests():
 
     print("Running compatibility tests...\n")
 
-    test_fns = (test_alldefconfig,
+    test_fns = (test_allmodconfig,
+                test_alldefconfig,
                 test_defconfig,
                 # Fails for a few defconfigs due to a bug in the C tools. Will
                 # be enabled once patches get in.
@@ -2000,6 +2001,23 @@ def test_allnoconfig_walk(conf, arch, srcarch):
 
     compare_configs(arch)
 
+def test_allmodconfig(conf, arch, srcarch):
+    """
+    Verify that allmodconfig.py generates the same .config as
+    'make allmodconfig', for each architecture. Runs the script via
+    'make scriptconfig', so kinda slow even in speedy mode.
+    """
+    # TODO: Support speedy mode for running the script
+    shell("make scriptconfig SCRIPT=Kconfiglib/allmodconfig.py "
+          "PYTHONCMD='{}'".format(sys.executable))
+    shell("mv .config ._config")
+    if speedy:
+        shell("scripts/kconfig/conf --allmodconfig Kconfig")
+    else:
+        shell("make allmodconfig")
+
+    compare_configs(arch)
+
 def test_allyesconfig(conf, arch, srcarch):
     """
     Verify that allyesconfig.py generates the same .config as