linux-kernel - Re: [PATCH] sound: depend on ZONE

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Date:	Mon, 16 Nov 2015 11:49:29 +0200
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Stable Tree <stable@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	linux-nvdimm@...ts.01.org, Jaroslav Kysela <perex@...ex.cz>,
	Jeff Moyer <jmoyer@...hat.com>
Subject: Re: [PATCH] sound: depend on ZONE_DMA

On 11/16/2015 11:28 AM, Takashi Iwai wrote:
<>
>>
>> Hi Greg
>>
>> Please include the mainline patch:
>> 	[2db1a57] ALSA: pci: depend on ZONE_DMA (by Dan Williams)
>>
>> To the stable tree for v4.3.X Kernel.
>>
>> This patch is needed for proper operation of the 4.3 pmem.ko driver. Long
>> story, but without this patch the persistent-memory will not be able to
>> work with the new 4.3 support of page-struct which is needed if we want to
>> RDMA and/or IO directly to persistent memory.
>> [Is to do with the new ZONE_DEVICE and too many ZONE(s) if ZONE_DMA is enabled]
> 
> Well, it's not exactly true: you just need to deselect some drivers to
> allow CONFIG_ZONE_DMA to be disabled.  It's merely another side of
> coin.
> 
> I don't mind including this to 4.3, though, but just want to correct
> the statement.
> 

This is true. Sorry for not being clear. We already have a script that we
give to clients to enable ZONE_DEVICE for 4.3 based systems. Is currently
simple based on this patch. Without this patch it will need to be more
complicated.

Thanks Takashi
Boaz

> 
> Takashi
> 

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