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Subjectoptimized script [Was: ARM defconfig files]
Hello,

On Tue, Jul 13, 2010 at 09:07:41AM +0200, Uwe Kleine-König wrote:
> Hi
>
> On Mon, Jul 12, 2010 at 01:50:47PM -0600, Grant Likely wrote:
> > On Mon, Jul 12, 2010 at 1:34 PM, Linus Torvalds
> > <torvalds@linux-foundation.org> wrote:
> > > On Mon, Jul 12, 2010 at 12:17 PM, Nicolas Pitre <nico@fluxnic.net> wrote:
> > >> I think Uwe could provide his script and add it to the kernel tree.
> > >> Then all architectures could benefit from it.  Having the defconfig
> > >> files contain only those options which are different from the defaults
> > >> is certainly more readable, even on x86.
> > >
> > > Quite possible. But maintainers would need to be on the lookout of
> > > people actually using the script, and refusing to apply patches that
> > > re-introduce the whole big thing.
> >
> > I can (partially) speak for powerpc. If ARM uses this approach, then
> > I think we can do the same. After the defconfigs are trimmed, I
> > certainly won't pick up any more full defconfigs.
> I just restarted my script on the powerpc defconfigs basing on rc5, I
> assume they complete in a few days time.
So Stephen was faster than me. I don't know yet how he optimised my
script, meanwhile I put some efforts into it, too by just checking lines
that match "^(# )?CONFIG_".

Find it attached.

I will start to reduce the remaining configs (i.e. all but arm and
powerpc).

Best regards
Uwe

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |#! /usr/bin/env python
# vim: set fileencoding=utf-8 :
# Copyright (C) 2010 by Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

import getopt
import re
import os
import subprocess
import sys

# This prevents including a timestamp in the .config which makes comparing a
# bit easier.
os.environ['KCONFIG_NOTIMESTAMP'] = 'Yes, please'

re_interesting = re.compile(r'^(# )?CONFIG_')

opts, args = getopt.getopt(sys.argv[1:], '', ['arch=', 'src='])

src = ''
arch = 'arm'

for o, a in opts:
if o == '--arch':
arch = a
elif o == '--src':
src = a

configdir = os.path.join(src, 'arch', arch, 'configs')

def all_defconfigs():
lc = len(configdir)
for root, dirs, files in os.walk(configdir):
root = root[lc + 1:]
for f in filter(lambda s: s.endswith('_defconfig'), files):
yield os.path.join(root, f)

if not args:
args = all_defconfigs()

for target in args:
defconfig_src = os.path.join(configdir, target)

subprocess.check_call(['make', '-s', 'ARCH=%s' % arch, target])
origconfig = list(open('.config'))
config = list(origconfig)
config_size = os.stat('.config').st_size

i = 0

while i < len(config):
mo = re_interesting.match(config[i])
if mo:
defconfig = open(defconfig_src, 'w')
defconfig.writelines(config[:i])
defconfig.writelines(config[i + 1:])
defconfig.close()
subprocess.check_call(['make', '-s', 'ARCH=%s' % arch, target])
if os.stat('.config').st_size == config_size and list(open('.config')) == origconfig:
print '-%s' % config[i][:-1]
del config[i]
else:
print ' %s' % config[i][:-1]
i += 1
else:
del config[i]

defconfig = open(defconfig_src, 'w')
defconfig.writelines(config)
defconfig.close()
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