Booting the Kernel:HEAD 5.2-rc2 kernel on, e.g., a Raspberry Pi 3 Model B I
get:

[    4.983797] module dm_mod: overflow in relocation type 258 val feefd014
...
[    6.731417] module phy_generic: overflow in relocation type 258 val d3d7172d
[  OK  ] Started udev Coldplug all Devices.
[    6.802239] i2c-bcm2835 3f805000.i2c: Could not read clock-frequency
property
[    6.803812] module mmc_core: overflow in relocation type 258 val d9c33bb1
[    6.820504] module usbcore: overflow in relocation type 258 val 9f68f2cc
[    6.922416] module mmc_core: overflow in relocation type 258 val d9c33bb1
[    6.981875] module mmc_core: overflow in relocation type 258 val d9c33bb1
[  OK  ] Reached target Remote File Systems (Pre).
[  OK  ] Reached target Remote File Systems.

This then leads to the rootfs on SD card not being found.