scripts/build-all.py - kernel/msm-4.9 - Gitiles

 #! /usr/bin/env python2

 # Copyright (c) 2009-2015, The Linux Foundation. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are met:
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above copyright
 #       notice, this list of conditions and the following disclaimer in the
 #       documentation and/or other materials provided with the distribution.
 #     * Neither the name of The Linux Foundation nor
 #       the names of its contributors may be used to endorse or promote
 #       products derived from this software without specific prior written
 #       permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 # IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 # NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 # OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 # OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 # ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 # Build the kernel for all targets using the Android build environment.

 from collections import namedtuple
 import glob
 from optparse import OptionParser
 import os
 import re
 import shutil
 import subprocess
 import sys
 import threading
 import Queue

 version = 'build-all.py, version 1.99'

 build_dir = '../all-kernels'
 make_command = ["vmlinux", "modules", "dtbs"]
 all_options = {}
 compile64 = os.environ.get('CROSS_COMPILE64')

 def error(msg):
     sys.stderr.write("error: %s\n" % msg)

 def fail(msg):
     """Fail with a user-printed message"""
     error(msg)
     sys.exit(1)

 if not os.environ.get('CROSS_COMPILE'):
     fail("CROSS_COMPILE must be set in the environment")

 def check_kernel():
     """Ensure that PWD is a kernel directory"""
     have_defconfig = any([
         os.path.isfile('arch/arm64/configs/msm_defconfig'),
         os.path.isfile('arch/arm64/configs/sdm845_defconfig')])

     if not all([os.path.isfile('MAINTAINERS'), have_defconfig]):
         fail("This doesn't seem to be an MSM kernel dir")

 def check_build():
     """Ensure that the build directory is present."""
     if not os.path.isdir(build_dir):
         try:
             os.makedirs(build_dir)
         except OSError as exc:
             if exc.errno == errno.EEXIST:
                 pass
             else:
                 raise

 failed_targets = []

 BuildResult = namedtuple('BuildResult', ['status', 'messages'])

 class BuildSequence(namedtuple('BuildSequence', ['log_name', 'short_name', 'steps'])):

     def set_width(self, width):
         self.width = width

     def __enter__(self):
         self.log = open(self.log_name, 'w')
     def __exit__(self, type, value, traceback):
         self.log.close()

     def run(self):
         self.status = None
         messages = ["Building: " + self.short_name]
         def printer(line):
             text = "[%-*s] %s" % (self.width, self.short_name, line)
             messages.append(text)
             self.log.write(text)
             self.log.write('\n')
         for step in self.steps:
             st = step.run(printer)
             if st:
                 self.status = BuildResult(self.short_name, messages)
                 break
         if not self.status:
             self.status = BuildResult(None, messages)

 class BuildTracker:
     """Manages all of the steps necessary to perform a build.  The
     build consists of one or more sequences of steps.  The different
     sequences can be processed independently, while the steps within a
     sequence must be done in order."""

     def __init__(self, parallel_builds):
         self.sequence = []
         self.lock = threading.Lock()
         self.parallel_builds = parallel_builds

     def add_sequence(self, log_name, short_name, steps):
         self.sequence.append(BuildSequence(log_name, short_name, steps))

     def longest_name(self):
         longest = 0
         for seq in self.sequence:
             longest = max(longest, len(seq.short_name))
         return longest

     def __repr__(self):
         return "BuildTracker(%s)" % self.sequence

     def run_child(self, seq):
         seq.set_width(self.longest)
         tok = self.build_tokens.get()
         with self.lock:
             print "Building:", seq.short_name
         with seq:
             seq.run()
             self.results.put(seq.status)
         self.build_tokens.put(tok)

     def run(self):
         self.longest = self.longest_name()
         self.results = Queue.Queue()
         children = []
         errors = []
         self.build_tokens = Queue.Queue()
         nthreads = self.parallel_builds
         print "Building with", nthreads, "threads"
         for i in range(nthreads):
             self.build_tokens.put(True)
         for seq in self.sequence:
             child = threading.Thread(target=self.run_child, args=[seq])
             children.append(child)
             child.start()
         for child in children:
             stats = self.results.get()
             if all_options.verbose:
                 with self.lock:
                     for line in stats.messages:
                         print line
                     sys.stdout.flush()
             if stats.status:
                 errors.append(stats.status)
         for child in children:
             child.join()
         if errors:
             fail("\n  ".join(["Failed targets:"] + errors))

 class PrintStep:
     """A step that just prints a message"""
     def __init__(self, message):
         self.message = message

     def run(self, outp):
         outp(self.message)

 class MkdirStep:
     """A step that makes a directory"""
     def __init__(self, direc):
         self.direc = direc

     def run(self, outp):
         outp("mkdir %s" % self.direc)
         os.mkdir(self.direc)

 class RmtreeStep:
     def __init__(self, direc):
         self.direc = direc

     def run(self, outp):
         outp("rmtree %s" % self.direc)
         shutil.rmtree(self.direc, ignore_errors=True)

 class CopyfileStep:
     def __init__(self, src, dest):
         self.src = src
         self.dest = dest

     def run(self, outp):
         outp("cp %s %s" % (self.src, self.dest))
         shutil.copyfile(self.src, self.dest)

 class ExecStep:
     def __init__(self, cmd, **kwargs):
         self.cmd = cmd
         self.kwargs = kwargs

     def run(self, outp):
         outp("exec: %s" % (" ".join(self.cmd),))
         with open('/dev/null', 'r') as devnull:
             proc = subprocess.Popen(self.cmd, stdin=devnull,
                     stdout=subprocess.PIPE,
                     stderr=subprocess.STDOUT,
                     **self.kwargs)
             stdout = proc.stdout
             while True:
                 line = stdout.readline()
                 if not line:
                     break
                 line = line.rstrip('\n')
                 outp(line)
             result = proc.wait()
             if result != 0:
                 return ('error', result)
             else:
                 return None

 class Builder():

     def __init__(self, name, defconfig):
         self.name = name
         self.defconfig = defconfig

         self.confname = self.defconfig.split('/')[-1]

         # Determine if this is a 64-bit target based on the location
         # of the defconfig.
         self.make_env = os.environ.copy()
         if "/arm64/" in defconfig:
             if compile64:
                 self.make_env['CROSS_COMPILE'] = compile64
             else:
                 fail("Attempting to build 64-bit, without setting CROSS_COMPILE64")
             self.make_env['ARCH'] = 'arm64'
         else:
             self.make_env['ARCH'] = 'arm'
         self.make_env['KCONFIG_NOTIMESTAMP'] = 'true'
         self.log_name = "%s/log-%s.log" % (build_dir, self.name)

     def build(self):
         steps = []
         dest_dir = os.path.join(build_dir, self.name)
         log_name = "%s/log-%s.log" % (build_dir, self.name)
         steps.append(PrintStep('Building %s in %s log %s' %
             (self.name, dest_dir, log_name)))
         if not os.path.isdir(dest_dir):
             steps.append(MkdirStep(dest_dir))
         defconfig = self.defconfig
         dotconfig = '%s/.config' % dest_dir
         savedefconfig = '%s/defconfig' % dest_dir

         staging_dir = 'install_staging'
         modi_dir = '%s' % staging_dir
         hdri_dir = '%s/usr' % staging_dir
         steps.append(RmtreeStep(os.path.join(dest_dir, staging_dir)))

         steps.append(ExecStep(['make', 'O=%s' % dest_dir,
             self.confname], env=self.make_env))

         if not all_options.updateconfigs:
             # Build targets can be dependent upon the completion of
             # previous build targets, so build them one at a time.
             cmd_line = ['make',
                 'INSTALL_HDR_PATH=%s' % hdri_dir,
                 'INSTALL_MOD_PATH=%s' % modi_dir,
                 'O=%s' % dest_dir]
             build_targets = []
             for c in make_command:
                 if re.match(r'^-{1,2}\w', c):
                     cmd_line.append(c)
                 else:
                     build_targets.append(c)
             for t in build_targets:
                 steps.append(ExecStep(cmd_line + [t], env=self.make_env))

         # Copy the defconfig back.
         if all_options.configs or all_options.updateconfigs:
             steps.append(ExecStep(['make', 'O=%s' % dest_dir,
                 'savedefconfig'], env=self.make_env))
             steps.append(CopyfileStep(savedefconfig, defconfig))

         return steps

 def update_config(file, str):
     print 'Updating %s with \'%s\'\n' % (file, str)
     with open(file, 'a') as defconfig:
         defconfig.write(str + '\n')

 def scan_configs():
     """Get the full list of defconfigs appropriate for this tree."""
     names = []
     arch_pats = (
         r'[fm]sm[0-9]*_defconfig',
         r'apq*_defconfig',
         r'qsd*_defconfig',
         r'mpq*_defconfig',
         r'sdm[0-9]*_defconfig',
         r'sdx*_defconfig',
         )
     arch64_pats = (
         r'msm*_defconfig',
         r'sdm[0-9]*_defconfig',
         r'sdx*_defconfig',
         )
     for p in arch_pats:
         for n in glob.glob('arch/arm/configs/' + p):
             name = os.path.basename(n)[:-10]
             names.append(Builder(name, n))
     if 'CROSS_COMPILE64' in os.environ:
         for p in arch64_pats:
             for n in glob.glob('arch/arm64/configs/' + p):
                 name = os.path.basename(n)[:-10] + "-64"
                 names.append(Builder(name, n))
     return names

 def build_many(targets):
     print "Building %d target(s)" % len(targets)

     # To try and make up for the link phase being serial, try to do
     # two full builds in parallel.  Don't do too many because lots of
     # parallel builds tends to use up available memory rather quickly.
     parallel = 2
     if all_options.jobs and all_options.jobs > 1:
         j = max(all_options.jobs / parallel, 2)
         make_command.append("-j" + str(j))

     tracker = BuildTracker(parallel)
     for target in targets:
         if all_options.updateconfigs:
             update_config(target.defconfig, all_options.updateconfigs)
         steps = target.build()
         tracker.add_sequence(target.log_name, target.name, steps)
     tracker.run()

 def main():
     global make_command

     check_kernel()
     check_build()

     configs = scan_configs()

     usage = ("""
            %prog [options] all                 -- Build all targets
            %prog [options] target target ...   -- List specific targets
            %prog [options] perf                -- Build all perf targets
            %prog [options] noperf              -- Build all non-perf targets""")
     parser = OptionParser(usage=usage, version=version)
     parser.add_option('--configs', action='store_true',
             dest='configs',
             help="Copy configs back into tree")
     parser.add_option('--list', action='store_true',
             dest='list',
             help='List available targets')
     parser.add_option('-v', '--verbose', action='store_true',
             dest='verbose',
             help='Output to stdout in addition to log file')
     parser.add_option('--oldconfig', action='store_true',
             dest='oldconfig',
             help='Only process "make oldconfig"')
     parser.add_option('--updateconfigs',
             dest='updateconfigs',
             help="Update defconfigs with provided option setting, "
                  "e.g. --updateconfigs=\'CONFIG_USE_THING=y\'")
     parser.add_option('-j', '--jobs', type='int', dest="jobs",
             help="Number of simultaneous jobs")
     parser.add_option('-l', '--load-average', type='int',
             dest='load_average',
             help="Don't start multiple jobs unless load is below LOAD_AVERAGE")
     parser.add_option('-k', '--keep-going', action='store_true',
             dest='keep_going', default=False,
             help="Keep building other targets if a target fails")
     parser.add_option('-m', '--make-target', action='append',
             help='Build the indicated make target (default: %s)' %
                  ' '.join(make_command))

     (options, args) = parser.parse_args()
     global all_options
     all_options = options

     if options.list:
         print "Available targets:"
         for target in configs:
             print "   %s" % target.name
         sys.exit(0)

     if options.oldconfig:
         make_command = ["oldconfig"]
     elif options.make_target:
         make_command = options.make_target

     if args == ['all']:
         build_many(configs)
     elif args == ['perf']:
         targets = []
         for t in configs:
             if "perf" in t.name:
                 targets.append(t)
         build_many(targets)
     elif args == ['noperf']:
         targets = []
         for t in configs:
             if "perf" not in t.name:
                 targets.append(t)
         build_many(targets)
     elif len(args) > 0:
         all_configs = {}
         for t in configs:
             all_configs[t.name] = t
         targets = []
         for t in args:
             if t not in all_configs:
                 parser.error("Target '%s' not one of %s" % (t, all_configs.keys()))
             targets.append(all_configs[t])
         build_many(targets)
     else:
         parser.error("Must specify a target to build, or 'all'")

 if __name__ == "__main__":
     main()
	#! /usr/bin/env python2

	# Copyright (c) 2009-2015, The Linux Foundation. All rights reserved.
	#
	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions are met:
	# * Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# * Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.
	# * Neither the name of The Linux Foundation nor
	# the names of its contributors may be used to endorse or promote
	# products derived from this software without specific prior written
	# permission.
	#
	# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	# IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	# NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
	# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
	# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
	# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	# Build the kernel for all targets using the Android build environment.

	from collections import namedtuple
	import glob
	from optparse import OptionParser
	import os
	import re
	import shutil
	import subprocess
	import sys
	import threading
	import Queue

	version = 'build-all.py, version 1.99'

	build_dir = '../all-kernels'
	make_command = ["vmlinux", "modules", "dtbs"]
	all_options = {}
	compile64 = os.environ.get('CROSS_COMPILE64')

	def error(msg):
	sys.stderr.write("error: %s\n" % msg)

	def fail(msg):
	"""Fail with a user-printed message"""
	error(msg)
	sys.exit(1)

	if not os.environ.get('CROSS_COMPILE'):
	fail("CROSS_COMPILE must be set in the environment")

	def check_kernel():
	"""Ensure that PWD is a kernel directory"""
	have_defconfig = any([
	os.path.isfile('arch/arm64/configs/msm_defconfig'),
	os.path.isfile('arch/arm64/configs/sdm845_defconfig')])

	if not all([os.path.isfile('MAINTAINERS'), have_defconfig]):
	fail("This doesn't seem to be an MSM kernel dir")

	def check_build():
	"""Ensure that the build directory is present."""
	if not os.path.isdir(build_dir):
	try:
	os.makedirs(build_dir)
	except OSError as exc:
	if exc.errno == errno.EEXIST:
	pass
	else:
	raise

	failed_targets = []

	BuildResult = namedtuple('BuildResult', ['status', 'messages'])

	class BuildSequence(namedtuple('BuildSequence', ['log_name', 'short_name', 'steps'])):

	def set_width(self, width):
	self.width = width

	def __enter__(self):
	self.log = open(self.log_name, 'w')
	def __exit__(self, type, value, traceback):
	self.log.close()

	def run(self):
	self.status = None
	messages = ["Building: " + self.short_name]
	def printer(line):
	text = "[%-*s] %s" % (self.width, self.short_name, line)
	messages.append(text)
	self.log.write(text)
	self.log.write('\n')
	for step in self.steps:
	st = step.run(printer)
	if st:
	self.status = BuildResult(self.short_name, messages)
	break
	if not self.status:
	self.status = BuildResult(None, messages)

	class BuildTracker:
	"""Manages all of the steps necessary to perform a build. The
	build consists of one or more sequences of steps. The different
	sequences can be processed independently, while the steps within a
	sequence must be done in order."""

	def __init__(self, parallel_builds):
	self.sequence = []
	self.lock = threading.Lock()
	self.parallel_builds = parallel_builds

	def add_sequence(self, log_name, short_name, steps):
	self.sequence.append(BuildSequence(log_name, short_name, steps))

	def longest_name(self):
	longest = 0
	for seq in self.sequence:
	longest = max(longest, len(seq.short_name))
	return longest

	def __repr__(self):
	return "BuildTracker(%s)" % self.sequence

	def run_child(self, seq):
	seq.set_width(self.longest)
	tok = self.build_tokens.get()
	with self.lock:
	print "Building:", seq.short_name
	with seq:
	seq.run()
	self.results.put(seq.status)
	self.build_tokens.put(tok)

	def run(self):
	self.longest = self.longest_name()
	self.results = Queue.Queue()
	children = []
	errors = []
	self.build_tokens = Queue.Queue()
	nthreads = self.parallel_builds
	print "Building with", nthreads, "threads"
	for i in range(nthreads):
	self.build_tokens.put(True)
	for seq in self.sequence:
	child = threading.Thread(target=self.run_child, args=[seq])
	children.append(child)
	child.start()
	for child in children:
	stats = self.results.get()
	if all_options.verbose:
	with self.lock:
	for line in stats.messages:
	print line
	sys.stdout.flush()
	if stats.status:
	errors.append(stats.status)
	for child in children:
	child.join()
	if errors:
	fail("\n ".join(["Failed targets:"] + errors))

	class PrintStep:
	"""A step that just prints a message"""
	def __init__(self, message):
	self.message = message

	def run(self, outp):
	outp(self.message)

	class MkdirStep:
	"""A step that makes a directory"""
	def __init__(self, direc):
	self.direc = direc

	def run(self, outp):
	outp("mkdir %s" % self.direc)
	os.mkdir(self.direc)

	class RmtreeStep:
	def __init__(self, direc):
	self.direc = direc

	def run(self, outp):
	outp("rmtree %s" % self.direc)
	shutil.rmtree(self.direc, ignore_errors=True)

	class CopyfileStep:
	def __init__(self, src, dest):
	self.src = src
	self.dest = dest

	def run(self, outp):
	outp("cp %s %s" % (self.src, self.dest))
	shutil.copyfile(self.src, self.dest)

	class ExecStep:
	def __init__(self, cmd, **kwargs):
	self.cmd = cmd
	self.kwargs = kwargs

	def run(self, outp):
	outp("exec: %s" % (" ".join(self.cmd),))
	with open('/dev/null', 'r') as devnull:
	proc = subprocess.Popen(self.cmd, stdin=devnull,
	stdout=subprocess.PIPE,
	stderr=subprocess.STDOUT,
	**self.kwargs)
	stdout = proc.stdout
	while True:
	line = stdout.readline()
	if not line:
	break
	line = line.rstrip('\n')
	outp(line)
	result = proc.wait()
	if result != 0:
	return ('error', result)
	else:
	return None

	class Builder():

	def __init__(self, name, defconfig):
	self.name = name
	self.defconfig = defconfig

	self.confname = self.defconfig.split('/')[-1]

	# Determine if this is a 64-bit target based on the location
	# of the defconfig.
	self.make_env = os.environ.copy()
	if "/arm64/" in defconfig:
	if compile64:
	self.make_env['CROSS_COMPILE'] = compile64
	else:
	fail("Attempting to build 64-bit, without setting CROSS_COMPILE64")
	self.make_env['ARCH'] = 'arm64'
	else:
	self.make_env['ARCH'] = 'arm'
	self.make_env['KCONFIG_NOTIMESTAMP'] = 'true'
	self.log_name = "%s/log-%s.log" % (build_dir, self.name)

	def build(self):
	steps = []
	dest_dir = os.path.join(build_dir, self.name)
	log_name = "%s/log-%s.log" % (build_dir, self.name)
	steps.append(PrintStep('Building %s in %s log %s' %
	(self.name, dest_dir, log_name)))
	if not os.path.isdir(dest_dir):
	steps.append(MkdirStep(dest_dir))
	defconfig = self.defconfig
	dotconfig = '%s/.config' % dest_dir
	savedefconfig = '%s/defconfig' % dest_dir

	staging_dir = 'install_staging'
	modi_dir = '%s' % staging_dir
	hdri_dir = '%s/usr' % staging_dir
	steps.append(RmtreeStep(os.path.join(dest_dir, staging_dir)))

	steps.append(ExecStep(['make', 'O=%s' % dest_dir,
	self.confname], env=self.make_env))

	if not all_options.updateconfigs:
	# Build targets can be dependent upon the completion of
	# previous build targets, so build them one at a time.
	cmd_line = ['make',
	'INSTALL_HDR_PATH=%s' % hdri_dir,
	'INSTALL_MOD_PATH=%s' % modi_dir,
	'O=%s' % dest_dir]
	build_targets = []
	for c in make_command:
	if re.match(r'^-{1,2}\w', c):
	cmd_line.append(c)
	else:
	build_targets.append(c)
	for t in build_targets:
	steps.append(ExecStep(cmd_line + [t], env=self.make_env))

	# Copy the defconfig back.
	if all_options.configs or all_options.updateconfigs:
	steps.append(ExecStep(['make', 'O=%s' % dest_dir,
	'savedefconfig'], env=self.make_env))
	steps.append(CopyfileStep(savedefconfig, defconfig))

	return steps

	def update_config(file, str):
	print 'Updating %s with \'%s\'\n' % (file, str)
	with open(file, 'a') as defconfig:
	defconfig.write(str + '\n')

	def scan_configs():
	"""Get the full list of defconfigs appropriate for this tree."""
	names = []
	arch_pats = (
	r'[fm]sm[0-9]*_defconfig',
	r'apq*_defconfig',
	r'qsd*_defconfig',
	r'mpq*_defconfig',
	r'sdm[0-9]*_defconfig',
	r'sdx*_defconfig',
	)
	arch64_pats = (
	r'msm*_defconfig',
	r'sdm[0-9]*_defconfig',
	r'sdx*_defconfig',
	)
	for p in arch_pats:
	for n in glob.glob('arch/arm/configs/' + p):
	name = os.path.basename(n)[:-10]
	names.append(Builder(name, n))
	if 'CROSS_COMPILE64' in os.environ:
	for p in arch64_pats:
	for n in glob.glob('arch/arm64/configs/' + p):
	name = os.path.basename(n)[:-10] + "-64"
	names.append(Builder(name, n))
	return names

	def build_many(targets):
	print "Building %d target(s)" % len(targets)

	# To try and make up for the link phase being serial, try to do
	# two full builds in parallel. Don't do too many because lots of
	# parallel builds tends to use up available memory rather quickly.
	parallel = 2
	if all_options.jobs and all_options.jobs > 1:
	j = max(all_options.jobs / parallel, 2)
	make_command.append("-j" + str(j))

	tracker = BuildTracker(parallel)
	for target in targets:
	if all_options.updateconfigs:
	update_config(target.defconfig, all_options.updateconfigs)
	steps = target.build()
	tracker.add_sequence(target.log_name, target.name, steps)
	tracker.run()

	def main():
	global make_command

	check_kernel()
	check_build()

	configs = scan_configs()

	usage = ("""
	%prog [options] all -- Build all targets
	%prog [options] target target ... -- List specific targets
	%prog [options] perf -- Build all perf targets
	%prog [options] noperf -- Build all non-perf targets""")
	parser = OptionParser(usage=usage, version=version)
	parser.add_option('--configs', action='store_true',
	dest='configs',
	help="Copy configs back into tree")
	parser.add_option('--list', action='store_true',
	dest='list',
	help='List available targets')
	parser.add_option('-v', '--verbose', action='store_true',
	dest='verbose',
	help='Output to stdout in addition to log file')
	parser.add_option('--oldconfig', action='store_true',
	dest='oldconfig',
	help='Only process "make oldconfig"')
	parser.add_option('--updateconfigs',
	dest='updateconfigs',
	help="Update defconfigs with provided option setting, "
	"e.g. --updateconfigs=\'CONFIG_USE_THING=y\'")
	parser.add_option('-j', '--jobs', type='int', dest="jobs",
	help="Number of simultaneous jobs")
	parser.add_option('-l', '--load-average', type='int',
	dest='load_average',
	help="Don't start multiple jobs unless load is below LOAD_AVERAGE")
	parser.add_option('-k', '--keep-going', action='store_true',
	dest='keep_going', default=False,
	help="Keep building other targets if a target fails")
	parser.add_option('-m', '--make-target', action='append',
	help='Build the indicated make target (default: %s)' %
	' '.join(make_command))

	(options, args) = parser.parse_args()
	global all_options
	all_options = options

	if options.list:
	print "Available targets:"
	for target in configs:
	print " %s" % target.name
	sys.exit(0)

	if options.oldconfig:
	make_command = ["oldconfig"]
	elif options.make_target:
	make_command = options.make_target

	if args == ['all']:
	build_many(configs)
	elif args == ['perf']:
	targets = []
	for t in configs:
	if "perf" in t.name:
	targets.append(t)
	build_many(targets)
	elif args == ['noperf']:
	targets = []
	for t in configs:
	if "perf" not in t.name:
	targets.append(t)
	build_many(targets)
	elif len(args) > 0:
	all_configs = {}
	for t in configs:
	all_configs[t.name] = t
	targets = []
	for t in args:
	if t not in all_configs:
	parser.error("Target '%s' not one of %s" % (t, all_configs.keys()))
	targets.append(all_configs[t])
	build_many(targets)
	else:
	parser.error("Must specify a target to build, or 'all'")

	if __name__ == "__main__":
	main()