[arch-general] kernel full compilation ?

[Pascal via arch-general]

hello,

I need to introduce a small modification in linux-5.4.23/block/blk-core.o :
do I need to recompile completely (~4 hours) or is there a way to shorten
the compilation time ?

I followed Kernel/Arch_Build_System
<https://wiki.archlinux.org/index.php/Kernel/Arch_Build_System>.

regards, lacsaP.