nios2 with nommu of the test-nios2 branch booting trapped with the ghost

WARNING: vmlinux.o(.text+0x98): Section mismatch in reference from the variable data_flush to the function .init.text:start_kernel()

The function data_flush() references

the function __init start_kernel().

This is often because data_flush lacks a __init

annotation or the annotation of start_kernel is wrong.

WARNING: vmlinux.o(.text+0x9c): Section mismatch in reference from the variable data_flush to the function .init.text:start_kernel()

The function data_flush() references

the function __init start_kernel().

This is often because data_flush lacks a __init

annotation or the annotation of start_kernel is wrong.

Maybe this is the problem that the kernel can not start up.

But I don not know how to solve this.

Can anyone help me ?

Thanks a lot.