How much kernel stack can be used in non-terminal function inside module ?

Having the kernel stack is limited to 4K, how can I know how many of this 4K was used
before mu function X()  is called ?

I need to extract 512 bytes of some data from storage using vfs_getxattr().  I can call for kmalloc or just use buffer on stack.

But how can assess whether I can safely do this or not ?

What was the stack utilization till my function was called, how much space is left?

And while I may take a diff of SP and Stack segment register to know stack utilization to the current moment ( I wonder whether if there are some kernel macro exist?)  I do knot know how to calculate future consumption of stack memory down the vfs call chain.

Regards,
Lev
   

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