__brk_base 8 arch/x86/include/asm/sections.h extern char __brk_base[], __brk_limit[]; __brk_base 92 arch/x86/kernel/head32.c ptep = (pte_t *)__pa(__brk_base); __brk_base 138 arch/x86/kernel/setup.c static __initdata unsigned long _brk_start = (unsigned long)__brk_base; __brk_base 139 arch/x86/kernel/setup.c unsigned long _brk_end = (unsigned long)__brk_base;