> Where does the x86-64 do the interrupt stack switch?
in entry_64.S
>
> I know the x86 32 bit interrupt handler switches to an irq/softirq
> context stack, but the 64 bit one doesn't appear to. Indeed,
> arch/x86/kernel/irq_{32,64}.c are very different, and only the 32
> bit irq handler switches to another stack to process the
> interrupts...
x86-64 always used interrupt stacks and has used softirq stacks
for a long time. 32bit got to it much later (the only good
thing left from that 4k stack "experiment")
-Andi
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