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SubjectRe: IrDA driver fails on PXA255
From
On Mon, May 30, 2011 at 1:17 AM, David Rientjes <rientjes@google.com> wrote:
> On Sun, 29 May 2011, Dmitry Eremin-Solenikov wrote:
>
>> What about changing your patch for less intrusive one (to emit a
>> WARN_ON) for at least one
>> or two major releases and only then changing it back to the current state?
>>
>
> That would return memory that is not guaranteed to be within the first
> 16MB of address space, so a GFP_DMA allocation would succeed with memory
> not from ZONE_DMA.  That's an invalid configuration, so users, including
> you, should at least edit their .config by hand to enable CONFIG_ZONE_DMA
> as a workaround.  Then, we should try to fix up the Kconfig entries for
> drivers requiring DMA allocations to select CONFIG_ZONE_DMA or fix
> defconfigs when DMA is known to be needed for a device.

Am I right that this was the previous behaviour for GFP_DMA allocations
w/o CONFIG_ZONE_DMA? If so, we can have it (probably) for one more
major release to get all warnings.

--
With best wishes
Dmitry
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