FIXADDR_USER_START  570 arch/ia64/include/asm/pgtable.h #define FIXADDR_USER_START	GATE_ADDR
FIXADDR_USER_START   80 arch/x86/um/asm/elf.h #define FIXADDR_USER_START      vsyscall_ehdr
FIXADDR_USER_START  181 arch/x86/um/asm/elf.h #define FIXADDR_USER_START      0