https://www.openwall.com/lists/kernel-hardening/2017/01/21/9
kernel-hardening - Re: [PATCH v1 1/3] x86/mm: Adapt MODULES_END based on Fixmap section size
https://android.googlesource.com/kernel/common/+/424f92bcbe8fa613ada7aec5ebe4ef434d5e50e4/arch/x86/include/asm/fixmap.h
arch/x86/include/asm/fixmap.h - kernel/common - Git at Google
archincludeasm