Re: [PATCH 3/6] Optional ZONE_DMA in the VM

Nick Piggin
2006-09-12T02:40:29Z

Christoph Lameter wrote:

>On Tue, 12 Sep 2006, Nick Piggin wrote:
>
>
>>I can't see from your patches, but what happens if someone asks
>>for a GFP_DMA page or dma slab allocation when there is no ZONE_DMA?
>>
>
>The page/slab allocator will simply ignore the flag and return
>ZONE_NORMAL memory. See gfp_zone().
>

That's wrong, I think? It should return NULL surely? (and possibly do
a printk telling the user they should enable ZONE_DMA config, although
some users have valid fallback strategies).

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