This is seen on ubuntu 20.04.1 aarch64 :
dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o matrixio.dtbo matrixio.dts
make -C /lib/modules/5.4.0-1022-raspi/build M=/home/ubuntu/matrixio-kernel-modules/src modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-1022-raspi'
CC [M] /home/ubuntu/matrixio-kernel-modules/src/matrixio-core.o
/home/ubuntu/matrixio-kernel-modules/src/matrixio-core.c: In function ‘matrixio_register_devices’:
/home/ubuntu/matrixio-kernel-modules/src/matrixio-core.c:221:1: warning: the frame size of 1232 bytes is larger than 1024 bytes [-Wframe-larger-than=]
221 | }
| ^
...
Probably harmless and easy to fix. Interestingly enough not seen on x86_64 - I assume it is because on x86_64, members of structures don't need to be aligned to 64-bit, so may be packed closer?