Hi,

I build with this config file [1], I have build different configs fragments
distro-overrides.config[2] and systemd.config[3] below to see how the size of vmlinux are growing:

building from commit:
commit b89e32ccd1be92a3643df3908d3026b09e271616

$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm multi_v7_defconfig
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
12273939        6301032  414356 18989327        121c10f vmlinux
$ wget https://raw.githubusercontent.com/96boards/meta-96boards/master/recipes-kernel/linux/linux-hikey-aosp/distro-overrides.config
$ make ARCH=arm multi_v7_defconfig ; ARCH=arm ./scripts/kconfig/merge_config.sh .config distro-overrides.config
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
12280711        6346608  414356 19041675        1228d8b vmlinux
$ wget https://raw.githubusercontent.com/96boards/meta-96boards/master/recipes-kernel/linux/linux-hikey-aosp/systemd.config
$ make ARCH=arm multi_v7_defconfig ; ARCH=arm ./scripts/kconfig/merge_config.sh .config distro-overrides.config systemd.config
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
12364663        6353684  418836 19137183        124029f vmlinux
$ make ARCH=arm multi_v7_defconfig ; ARCH=arm ./scripts/kconfig/merge_config.sh .config addons.config distro-overrides.config systemd.config
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
12384683        6363148  418836 19166667        12475cb vmlinux
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm kselftest-merge
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
15431608        8191844 7891508 31514960        1e0e150 vmlinux
15454072        8201820 7891572 31547464        1e16048 vmlinux


$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm multi_v7_defconfig
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm kselftest-merge
$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm vmlinux
$ size vmlinux
   text    data     bss     dec     hex filename
15446244 8100904 7886132 31433280 1dfa240 vmlinux

[1] http://snapshots.linaro.org/openembedded/lkft/morty/am57xx-evm/rpb/linux-mainline/622/config
[2] https://raw.githubusercontent.com/96boards/meta-96boards/master/recipes-kernel/linux/linux-hikey-aosp/distro-overrides.config
[3]