linux-kernel - Re: IrDA driver fails on PXA255

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Message-ID: <BANLkTi=RWG_iiyd1f_aGEpqk9Cbh1dT7iw@mail.gmail.com>
Date:	Mon, 30 May 2011 01:33:26 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Eric Miao <eric.y.miao@...il.com>,
	Samuel Ortiz <samuel@...tiz.org>
Subject: Re: IrDA driver fails on PXA255

On Mon, May 30, 2011 at 1:17 AM, David Rientjes <rientjes@...gle.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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