Messages in this thread | | | Date | Fri, 29 Jan 2016 19:00:42 +0600 | From | Alexnader Kuleshov <> | Subject | Why do we reserve 8 bytes on top of the boot time stack? |
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Hello,
We reserve top 8 bytes of the boot stack in the arch/x86/kernel/head_64.S:
GLOBAL(stack_start) .quad init_thread_union+THREAD_SIZE-8
So, the question is in subject. Why? I've found definition of the TOP_OF_KERNEL_STACK_PADDING macro arch/x86/include/asm/thread_info.h, but it is zero for the x86_64.
Thank you.
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