[PATCH] [POWERPC] Clean up some linker and symbol usage

[Kumar Gala]

On Mar 27, 2008, at 7:45 PM, Michael Ellerman wrote:
>
> On Fri, 2008-03-28 at 10:14 +1100, Paul Mackerras wrote:
>> Kumar Gala writes:
>>
>>> @@ -1124,7 +1124,7 @@ void __init early_init_devtree(void *params)
>>> 	parse_early_param();
>>>
>>> 	/* Reserve LMB regions used by kernel, initrd, dt, etc... */
>>> -	lmb_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
>>> +	lmb_reserve(__pa(_stext), _end - _stext);
>>
>> In the kdump case where the kernel starts at the 32MB point
>> (physical), wouldn't we want to reserve the first 32MB of RAM so that
>> it can't get allocated and used for random things?  Doesn't that  
>> first
>> 32MB contain the old kernel that we want to write out?
>
> For kdump there is nMB of memory reserved at 32MB for the 2nd kernel,
> and that's all it gets, all of the other memory is the old kernel text
> or the old kernel's data.

My understanding is those reservations are handled by the device tree  
that is passed to the 2nd kernel.

- k