CONFIG_4KSTACK with rt patch

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I have a question regarding CONFIG_4KSTACK. From the code it looks
like with rt patch and CONFIG_PREEMPT_SOFTIRQ enabled, codepath still
uses interrupt stack rather than softirq thread's own stack. Is it
correct?
Should CONFIG_4KSTACK enabled with CONFIG_PREMPT_SOFTIRQ also enabled?

Thanks,
Meha
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