4kb for kernel stack - what is that?

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In "kernel hacking" when u do "make menuconfig", there is a 4kb for
stack stack thing - what is that?   I have that compiled and the
current kernel is running with that enabled.

Then in my kernel module, I delcared a local variable of "char
xxxx[1024*1024]" which is 1Mb local stack variable, and the modules
executed, and fill the array, and output in dmesg.   No error
involved.   So what is that compilation option?

-- 
Regards,
Peter Teoh

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