RE: ACPI stack overflow

[Stuart_Hayes]

Richard B. Johnson wrote:
> On Fri, 5 Mar 2004 Stuart_Hayes@xxxxxxxx wrote:
> 
>> 
>> Hello...
>> 
>> I think I am getting a stack overflow when Linux is parsing the ACPI
>> tables (initializing all the devices and running all the _STA
>> methods). I am using the x86_64 architecture.  I would like to try
>> increasing the kernel stack size, but I'm not sure how to go about
>> doing this. 
>> Could someone tell me how to increase the kernel stack size?
>> (And, has anyone else seen a problem with stack overflows with ACPI?)
>> 
> 
> Please fix your mailer. In Unix/Linux, we put in a [Enter] ('\n')
> every once in awhile, usually every 79 charcters so that a line
> of text does not exceed 80 characters. We do not let some indefinite
> screen "auto-wrap".
> 
>> Thanks!
>> Stuart
>> stuart_hayes@xxxxxxxx
> 
> There have been continual changes over the years to reduce the
> amount of kernel stack that the kernel uses because kernel stack-
> space is "expensive". It needs to be changed in pages.  I think
> that if you have a stack-overflow, then you are writing poor
> kernel code. In the kernel, do not put arrays on the stack, i.e,
> in "local" space. Use kmalloc()/kfree() instead.
> 
> Basically, do not increase the stack size. It just masks problems.
> It does not make them go away. If you need more stack, you
> are doing something wrong.
> 
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
>             Note 96.31% of all statistics are fiction.

Thanks.  Unfortunately, it isn't my code that's using so much stack 
space--it's the ACPI "driver".  It has many deep nested calls, and 
I believe each call in x86_64 is taking more stack space than it would
 in i386 because of the larger registers.  But, what I really wanted
 to do is increase the kernel size to verify that the problem is a 
stack overflow (my other tests have led me to believe so).  I wasn't 
going to propose that as a solution.

Thanks!
Stuart

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