Re: [PATCH] Make GFP_DMA allocations w/o ZONE_DMA emit a warninginstead of failing

From: KOSAKI Motohiro
Date: Wed Jun 01 2011 - 08:39:27 EST

2011/6/1 Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>:
> Please be more polite to other people. After a197b59ae6 all allocations
> with GFP_DMA set on nodes without ZONE_DMA fail nearly silently (only
> one warning during bootup is emited, no matter how many things fail).
> This is a very crude change on behaviour. To be more civil, instead of
> failing emit noisy warnings each time smbd. tries to allocate a GFP_DMA
> memory on non-ZONE_DMA node.
> This change should be reverted after one or two major releases, but
> we should be more accurate rather than hoping for the best.
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
> Cc: David Rientjes <rientjes@xxxxxxxxxx>
> Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
> Cc: Mel Gorman <mel@xxxxxxxxx>
> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>

Instaed of, shouldn't we revert a197b59ae6? Some arch don't have
DMA_ZONE at all.
and a197b59ae6 only care x86 embedded case. If we accept your patch, I
can imagine
other people will claim warn foold is a bug. ;)

However, I think, you should explain which platform and drivers hit
this breakage.
Otherwise developers can't learn which platform should care.

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