[arch-general] kernel compilation

[Pascal]

hello members,

I'm not used to compiling and therefore even less to compiling the
kernel....

I followed the instructions given by this page
<https://wiki.archlinux.org/index.php/Kernel/Arch_Build_System>.

after compilation, if I modify/patch file src/linux-4.19/block/blk-core.c,
do I have to replace the kernel ? the kernel and all its modules ? or just
the module concerned by the change (if it concerns a module) ?

regards, lacsaP.