[PATCH v4] [POWERPC] Move to runtime allocated exception stacks

[Kumar Gala]

On May 31, 2008, at 12:04 AM, Paul Mackerras wrote:

> Kumar Gala writes:
>
>> For the additonal exception levels (critical, debug, machine check)  
>> on
>> 40x/book-e we were using "static" allocations of the stack in the
>> associated head.S.
>>
>> Move to a runtime allocation to make the code a bit easier to read as
>> we mimic how we handle IRQ stacks.  Its also a bit easier to setup  
>> the
>> stack with a "dummy" thread_info in C code.
>
> Looks fine, with just one very minor comment:
>
>> -	addi	r11,r11,THREAD_SIZE;					     \
>> -1:	subi	r11,r11,INT_FRAME_SIZE;	/* Allocate an exception frame      
>> */\
>> +1:	addi	r11,r11,THREAD_SIZE;					     \
>> +	subi	r11,r11,INT_FRAME_SIZE;	/* Allocate an exception frame     */\
>
> You could make that a single addi r11,r11,THREAD_SIZE-INT_FRAME_SIZE
> now.

I remember noticing that and thinking I should go back in fix.  Will  
look at doing that and add the patches to my powerpc-next tree.

- k