diff --git a/libc/kernel/tools/update_all.py b/libc/kernel/tools/update_all.py
new file mode 100755
index 0000000..6272fcf
--- /dev/null
+++ b/libc/kernel/tools/update_all.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+#
+import sys, cpp, kernel, glob, os, re, getopt, clean_header
+from defaults import *
+from utils import *
+
+def usage():
+    print """\
+  usage: %(progname)s
+
+    this program is used to update all the auto-generated clean headers
+    used by the Bionic C library. it assumes the following:
+
+      - a set of source kernel headers is located in '../original',
+        relative to the program's directory
+
+      - the clean headers will be placed in '../arch-<arch>/asm',
+        '../common/linux', '../common/asm-generic', etc..
+
+      - if ANDROID_PRODUCT_OUT is defined in your environment, you're
+        using the Android build system, and the program will issue
+        p4 add / edit / delete commands to update the depot for you.
+        (you'll need to p4 submit manually though)
+""" % { "progname" : os.path.basename(sys.argv[0]) }
+    sys.exit(0)
+
+try:
+    optlist, args = getopt.getopt( sys.argv[1:], '' )
+except:
+    # unrecognized option
+    sys.stderr.write( "error: unrecognized option\n" )
+    usage()
+
+if len(optlist) > 0 or len(args) > 0:
+    usage()
+
+progdir = find_program_dir()
+original_dir = os.path.normpath( progdir + "/../original" )
+if not os.path.isdir( original_dir ):
+    panic( "required directory does not exists: %s\n" % original_dir )
+
+# find all source files in 'original'
+#
+sources = []
+for root, dirs, files in os.walk( original_dir ):
+    for file in files:
+        base, ext = os.path.splitext(file)
+        if ext == ".h":
+            sources.append( "%s/%s" % (root,file) )
+
+b = BatchFileUpdater()
+
+for arch in kernel_archs:
+    b.readDir( os.path.normpath( progdir + "/../arch-%s" % arch ) )
+
+b.readDir( os.path.normpath( progdir + "/../common" ) )
+
+#print "OLD " + repr(b.old_files)
+
+for path in sources:
+    dst_path, newdata = clean_header.cleanupFile(path)
+    if not dst_path:
+        continue
+
+    b.readFile( dst_path )
+    r = b.editFile( dst_path, newdata )
+    if r == 0:
+        r = "unchanged"
+    elif r == 1:
+        r = "edited"
+    else:
+        r = "added"
+
+    print "cleaning: %-*s -> %-*s (%s)" % ( 35, path, 35, dst_path, r )
+
+usePerforce = os.environ.has_key("ANDROID_PRODUCT_OUT")
+
+if usePerforce:
+    b.updateP4Files()
+else:
+    b.updateFiles()
+
+sys.exit(0)