你给的信息有误，是mno-red-zone！
英语的介绍是：
What is the 'red-zone'?
The red-zone is a feature described in the x86-64 ABI.
It is a 128 byte long region located directly below the stack pointer. This region is free-for-use for the compiler without the requirement to notify the application / the os or any running interrupt handler.
For user applications there is no issue as interrupts and other kernel related code won't interfere with the user stack. In your kernel however things can get ugly especially so if you have nested interrupts and no red-zone support. Imagine running inside your interrupt handler gcc puts some data inside the red zone a nested interrupt occurs and clobbers the red-zone or vice versa.
To get around this the red-zone can be disabled by passing -mno-red-zone to GCC.
x86_64-elf-gcc $CFLAGS -mno-red-zone ...
