Messages in this thread | | | Subject | Re: Kernel Stack Limit... | From | Robert Love <> | Date | 29 Aug 2002 15:15:13 -0400 |
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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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