implicit declaration of function ‘ioremap_nocache

[Thinkcore88]

Any chance to fix this error (newest ubuntu):

error: implicit declaration of function ‘ioremap_nocache’ [-Werror=implicit-function-declaration]
60 | buffer = (char*) ioremap_nocache(RESERVED_START, RESERVED_SIZE);
| ^~~~~~~~~~~~~~~
/home/karol/bitleaker/bitleaker-kernel-module/bitleaker-kernel-module.c:60:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
60 | buffer = (char*) ioremap_nocache(RESERVED_START, RESERVED_SIZE);
| ^
/home/karol/bitleaker/bitleaker-kernel-module/bitleaker-kernel-module.c:85:9: error: implicit declaration of function ‘iounmap’; did you mean ‘do_munmap’? [-Werror=implicit-function-declaration]
85 | iounmap(buffer);
| ^~~~~~~
| do_munmap
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:257: /home/karol/bitleaker/bitleaker-kernel-module/bitleaker-kernel-module.o] Error 1
make[1]: *** [Makefile:1850: /home/karol/bitleaker/bitleaker-kernel-module] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.19.0-38-generic'
make: *** [Makefile:4: all] Error 2
Finished.