Re: kernel stack challenge

[Helge Hafting]

Sergiy Lozovsky wrote:
> Hi,
>
> I have a stack hungry code in the kernel. It hits the
> end of stack from time to time. I wrote function to
> which I pass pointers to function and memory area
> which should be used as stack for function execution.
> (I just load pointer to new stack area into esp
> register). This function works just fine in user space
> and memory area provided by me is used as stack.
>
> This function doesn't work in the kernel (system hungs
> instantly when my function is called). Does antbody
> have any idea what the reason can be? Some special
> alignment? Special memory segment? In what direction
> should I look?
>
> (sure I tried some magic with alignment like -
> __attribute__ ((aligned (8192))) - no any effect)
>
> (there was some patch to increase stack size
> kernelwide, but I don't want to affect all the
> system).


You aren't supposed to need much stack for anything in the kernel.
Consider rewriting your function to use allocated
memory instead of stack, this isn't all that hard.

Helge Hafting

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