On Mon, 19 Sep 2016 16:20:12 +0530, Madhu K said:

> That means kernel maintainer will define default configuration for his
> architecture not for all architecture, I mean kernel maintainer might have
> defined configuration for x86, not for ARM, POWERPC and all, is my
> understanding correct?, if not please correct me.

There's more than one defconfig file.  Even more than one per architecture.
For many, there's a separate defconfig for each board:

[/usr/src/linux-next] for i in arch/*/configs; do echo -n "$i: "; find $i -name 
'*defconfig' | wc -l; done
arch/arc/configs: 15
arch/arm/configs: 112
arch/arm64/configs: 1
arch/avr32/configs: 15
arch/blackfin/configs: 29
arch/c6x/configs: 5
arch/cris/configs: 4
arch/h8300/configs: 3
arch/hexagon/configs: 1
arch/ia64/configs: 6
arch/m32r/configs: 12
arch/m68k/configs: 19
arch/metag/configs: 4
arch/microblaze/configs: 2
arch/mips/configs: 61
arch/mn10300/configs: 2
arch/nios2/configs: 2
arch/openrisc/configs: 1
arch/parisc/configs: 8
arch/powerpc/configs: 99
arch/s390/configs: 4
arch/score/configs: 1
arch/sh/configs: 56
arch/sparc/configs: 2
arch/tile/configs: 2
arch/um/configs: 2
arch/unicore32/configs: 1
arch/x86/configs: 2
arch/xtensa/configs: 6

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