kernel_init: undefined reference to `populate_rootfs_domain'

Hi Surbhi,

FYI, kernel build failed on

commit: 5e345495110f8f7b44e078de5a4f803f9bc70e4c UBUNTU: SAUCE: Make populate_rootfs asynchronous
config: um-defconfig

All error/warnings:

init/built-in.o: In function `kernel_init':
main.c:(.init.text+0xc38): undefined reference to `populate_rootfs_domain'
collect2: error: ld returned 1 exit status

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0-DAY kernel build testing backend Open Source Technology Centre
Fengguang Wu, Yuanhan Liu Intel Corporation