1 GB lowmem

[Kumar Gala]

On May 21, 2008, at 4:24 PM, Rune Torgersen wrote:

> Kumar Gala wrote:
>> On May 21, 2008, at 3:55 PM, Rune Torgersen wrote:
>>> Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x80000000. Now it
>>> works in both vaniulla an d RT kernel.
>>
>> We should really add some sanity check on CONFIG_TASK_SIZE vs
>> KERNEL_START.
>
> Something like this?
> Wording sould probablyy be a bit different/cleare.
>
> diff --git a/include/asm-powerpc/processor.h
> b/include/asm-powerpc/processor.h
> index fd98ca9..72e0e3f 100644
> --- a/include/asm-powerpc/processor.h
> +++ b/include/asm-powerpc/processor.h
> @@ -81,6 +81,10 @@ extern struct task_struct *last_task_used_altivec;
> extern struct task_struct *last_task_used_spe;
>
> #ifdef CONFIG_PPC32
> +
> +#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
> +#error User TASK_SIZE overlaps with KERNEL_START address
> +#endif
> #define TASK_SIZE      (CONFIG_TASK_SIZE)
>
> /* This decides where the kernel will search for a free chunk of vm
>

something like that would be good.  is there really anything PPC32  
specific about it?

- k