BOOT_PERCPU_OFFSET 35 arch/x86/kernel/setup_percpu.c DEFINE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off) = BOOT_PERCPU_OFFSET; BOOT_PERCPU_OFFSET 39 arch/x86/kernel/setup_percpu.c [0 ... NR_CPUS-1] = BOOT_PERCPU_OFFSET,