__cpu_up_stack_pointer 16 arch/riscv/kernel/head.h extern void *__cpu_up_stack_pointer[]; __cpu_up_stack_pointer 36 arch/riscv/kernel/smpboot.c void *__cpu_up_stack_pointer[NR_CPUS]; __cpu_up_stack_pointer 113 arch/riscv/kernel/smpboot.c WRITE_ONCE(__cpu_up_stack_pointer[hartid],