[Letux-kernel] bloated defconfigs

H. Nikolaus Schaller hns at goldelico.com
Sun Jul 29 08:30:20 CEST 2018


Hi,

> Am 28.07.2018 um 15:04 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> Hi,
> 
> I just stumbled upon our defconfigs.
> 
> andi at aktux:~/gta04/gta04-kernel$ ls -l arch/arm/configs/ -Sr | tail -n
> 10 -rw-r--r-- 1 andi andi   9524 Apr  7 14:53 imote2_defconfig
> -rw-r--r-- 1 andi andi   9985 Jul 28 13:34 imx_v6_v7_defconfig
> -rw-r--r-- 1 andi andi  10118 Apr  7 14:53 ezx_defconfig
> -rw-r--r-- 1 andi andi  10665 Apr  7 14:53 s3c2410_defconfig
> -rw-r--r-- 1 andi andi  13161 May 29 18:14 omap2plus_defconfig
> -rw-r--r-- 1 andi andi  17834 May 29 18:14 pxa_defconfig
> -rw-r--r-- 1 andi andi  24624 Jul 28 13:34 multi_v7_defconfig
> -rw-r--r-- 1 andi andi 157222 Jul 28 13:34 letux_udoo_defconfig
> -rw-r--r-- 1 andi andi 157271 Jul 28 13:34 letux_lpae_defconfig
> -rw-r--r-- 1 andi andi 157352 Jul 28 13:34 letux_defconfig
> 
> 
> So we are bloated somehow.

Yes, we git commit the full defconfig.

> So I am wondering how these defconfigs are
> created. AFAIK the tool is
> 
> make ARCH=arm CROSS_COMPILE=... savedefconfig
> 
> the file can then be used as a defconfig. I just did it and copied it
> over to .config and used
> make ARCH=arm CROSS_COMPILE=... olddefconfig

Indeed this tool can be used to shrink it to "differences".

> 
> The result is the same. But the defconfig created by savedefconfig is
> only 20KB. Well, what is the advantage? We have a better overview where
> we have non-default values.

Yes, but on the other hand we loose the overview what has been configured
by looking just into the git tree. I often use this to check what is being
done by Makefiles, especially with code I have never inspected before.
So basically I am not really interested in the defaults...

So I'd think we should pack make ARCH=arm CROSS_COMPILE=... savedefconfig
into a local tool and run only if we need to get the better overview
about non-default values.

BR,
Nikolaus

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