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SubjectRe: Kernel Stack Limit...
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On Thu, 2002-08-29 at 15:07, Raj, Ashok wrote:

> Please reply to me, since i dont have this email id on the list.
>
> Could someone tell me at what the kernel stack size limit is?

It depends on the architecture. 8KB for x86 and most others. Some
(all?) 64-bit platforms have 16KB stacks.

Note the effective size is actually (8KB - sizeof(task_struct)) in 2.4
and (8KB - sizeof(thread_info)) in 2.5 since those structures are stored
at the top of the stack.

Also note interrupts share the stack.

> Is there a gcc option for x86 that can warn if too large variables are
> specified in the stack?

I believe 2.4-ac has a stack overflow check in it... as does the RedHat
kernel - check it out.

Also kgdb (or at least our copy here at MontaVista) has a stack overflow
check.

Robert Love

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