It depends on whether you have CONFIG_4KSTACKS or not.
If it's not defined, then you have 8k stacks for each thread, and the stack of a thread is used during the execution of the ISR that interrupted its execution.
If it's defined, then you have 4k stacks for each thread, and a separate stack to handle the ISRs.
Isn't the above statement x86 focussed? Or is the option only available on x86 (the stack size configurable only on x86)?
I read you can configure it to one page (in which case ISR will have separate stack) or two page (in which case ISR will share stack)?
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