[PATCH 1/3] score: Remove _Stack_Adjust_size()

[Sebastian Huber]

On 04/11/2012 11:53 AM, sebastian.huber at embedded-brains.de wrote:
> From: Sebastian Huber<sebastian.huber at embedded-brains.de>
>
> The increase of the stack size by CPU_STACK_ALIGNMENT in
> _Thread_Stack_Allocate() is disadvantageous.  This may lead to a huge
> over allocation for specialized stack allocators.  The
> CPU_STACK_ALIGNMENT is at most 16 on all current RTEMS CPU ports.  The
> mimimum stack size ensured by _Stack_Ensure_minimum() must be
> considerable larger than this value, otherwise stack overflows will
> likely occur.  Thus the _Stack_Adjust_size() is also superfluous.

I would like to have your comments on this.  The background is that I have a 
special task stack allocator that has a page size of 4k due to some MMU/MPU 
constraints.  Thus if I request a stack size of 4k, this _Stack_Adjust_size() 
adjusts it to 4k + 4 which results in 8k allocated.  Quite a waste of memory.

-- 
Sebastian Huber, embedded brains GmbH

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