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From: Arnd Bergmann on 12 Jul 2010 16:40
On Monday 12 July 2010 20:50:29 Uwe Kleine-K�nig wrote:
>
> [1] The following changes since commit 67a3e12b05e055c0415c556a315a3d3eb637e29e:
>
> Linux 2.6.35-rc1 (2010-05-30 13:21:02 -0700)
>
> are available in the git repository at:
> git://git.pengutronix.de/git/ukl/linux-2.6.git arm/defconfig/reduced-v2.6.35-rc1

BTW, looking at the most common entries in there, I think we might at some
point want to change some of the defaults in the respective Kconfig files.
Right now an empty defconfig would result in a configuration without
file system, networking or modules:

sort arch/arm/configs/* | uniq -c | sort -n | tail -n 30
114 CONFIG_BLK_DEV_RAM=y
116 CONFIG_BLK_DEV_INITRD=y
116 CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
117 CONFIG_NFS_FS=y
118 CONFIG_MTD_CHAR=y
119 CONFIG_INOTIFY=y
122 # CONFIG_BLK_DEV_BSG is not set
122 CONFIG_IP_PNP=y
123 # CONFIG_IPV6 is not set
123 CONFIG_MTD_BLOCK=y
125 CONFIG_FPE_NWFPE=y
127 CONFIG_NET_ETHERNET=y
128 CONFIG_LOG_BUF_SHIFT=14
128 CONFIG_MTD=y
131 CONFIG_PACKET=y
132 # CONFIG_INPUT_MOUSE is not set
133 CONFIG_DEBUG_KERNEL=y
134 CONFIG_EXT2_FS=y
138 CONFIG_MODULE_UNLOAD=y
139 CONFIG_TMPFS=y
142 CONFIG_NETDEVICES=y
147 CONFIG_ZBOOT_ROM_BSS=0x0
147 CONFIG_ZBOOT_ROM_TEXT=0x0
151 CONFIG_INET=y
151 CONFIG_UNIX=y
153 CONFIG_NET=y
156 # CONFIG_VGA_CONSOLE is not set
158 CONFIG_MODULES=y
164 CONFIG_SYSVIPC=y
174 CONFIG_EXPERIMENTAL=y

Also, some of the defconfigs contain stuff that arguably does not belong
into a defconfig and could be removed in the next merge window, e.g.

ezx_defconfig:CONFIG_LOCALVERSION="-ezx200910312315"
pnx4008_defconfig:CONFIG_DECNET=m
at572d940hfek_defconfig:CONFIG_SGI_PARTITION=y

Arnd
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From: Nicolas Pitre on 12 Jul 2010 17:00
On Mon, 12 Jul 2010, Arnd Bergmann wrote:

> On Monday 12 July 2010 20:50:29 Uwe Kleine-K�nig wrote:
> >
> > [1] The following changes since commit 67a3e12b05e055c0415c556a315a3d3eb637e29e:
> >
> > Linux 2.6.35-rc1 (2010-05-30 13:21:02 -0700)
> >
> > are available in the git repository at:
> > git://git.pengutronix.de/git/ukl/linux-2.6.git arm/defconfig/reduced-v2.6.35-rc1
>
> BTW, looking at the most common entries in there, I think we might at some
> point want to change some of the defaults in the respective Kconfig files.
> Right now an empty defconfig would result in a configuration without
> file system, networking or modules:

We need to come up with a scheme that allows for expressing the most
likely options you might want if you have machine x and/or machine y
selected. Those likely options are for drivers corresponding to
hardware soldered on the board or integrated into a SOC and therefore
which is not "optional". Right now this information is carried in the
defconfig files. Without that you need to lookup various datasheets and
wade through thousands of Kconfig options. Compared to that, stuff like
filesystems and networking protocols are optional items that currently
are more arbitrarily included into or excluded from the defconfig files.

I think that the first category of options should automatically be
selected on a per machine basis depending on BASE_CONFIG or the like and
expressed directly in the Kconfig files. Typically there are very few
of those (like a dozen or so for some example target I looked at).


Nicolas
From: Linus Torvalds on 12 Jul 2010 18:00
On Mon, Jul 12, 2010 at 1:29 PM, Nicolas Pitre <nico(a)fluxnic.net> wrote:
>
> For the record, I do support Uwe's work too. �I do wish it could go in
> now so that from that point going forward we could only focus on
> improving the thing instead of having to care about implications during
> the merge window.

Ok, I merged it. I do love the diffstat. And while it may not be
optimal or a final solution, nobody seems to hate it either.

Linus
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From: David Brown on 12 Jul 2010 19:10
On Monday 12 July 2010 11:50:29 Uwe Kleine-K�nig wrote:

> If it helps the powerpc people I can reduce their defconfigs, too.

Do you have scripts or tools that you did this with, or is a manual
process. We're about to add several new (ARM) targets, and it'd be
nice to be able to make small defconfigs for those targets as well.

Thanks,
David
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From: Linus Torvalds on 12 Jul 2010 19:20
2010/7/12 David Brown <davidb(a)codeaurora.org>:
>
> Do you have scripts or tools that you did this with, or is a manual
> process. �We're about to add several new (ARM) targets, and it'd be
> nice to be able to make small defconfigs for those targets as well.

Uwe posted it earlier in this thread as an attachement, and I put the
python script into the merge commit message too. And we should
probably put it somewhere in scripts too, and/or make a 'make' target
to create the small config files.

I pushed it all out, and tagged it as -rc5.

Linus
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