Re: [patch] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT

[Ingo Molnar]

* Heiko Carstens <heiko.carstens@xxxxxxxxxx> wrote:

> From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> 
> __alloc_bootmem_low() and __alloc_bootmem_low_node() should use 
> MAX_DMA_ADDRESS as limit which is per architecture instead of a global 
> LOW32LIMIT. Otherwise the bootmem allocator may return addresses to 
> memory regions which cannot be used for DMA access.

> -#define LOW32LIMIT 0xffffffff

>  		if ((ptr = __alloc_bootmem_core(bdata, size,
> -						 align, goal, LOW32LIMIT)))
> +						 align, goal, MAX_DMA_ADDRESS)))

but this limits things to 16MB on i686. Are you sure this wont break 
anything?

	Ingo
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