linux-kernel - Re: [PATCH v2 4/7] sparc32: Do not select ZONE

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Message-Id: <5648dca0-4853-4dfb-91cf-282a656beb1e@app.fastmail.com>
Date: Tue, 05 Mar 2024 16:26:18 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andreas Larsson" <andreas@...sler.com>,
 "Sam Ravnborg" <sam@...nborg.org>, "Maciej W. Rozycki" <macro@...am.me.uk>,
 sparclinux@...r.kernel.org, "Randy Dunlap" <rdunlap@...radead.org>
Cc: "Miquel Raynal" <miquel.raynal@...tlin.com>,
 linux-parport@...ts.infradead.org, "David S . Miller" <davem@...emloft.net>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/7] sparc32: Do not select ZONE_DMA

On Tue, Mar 5, 2024, at 16:06, Andreas Larsson wrote:
> On 2024-02-24 18:42, Sam Ravnborg via B4 Relay wrote:

>> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
>> index 734f23daecca..bdbde506c01e 100644
>> --- a/arch/sparc/Kconfig
>> +++ b/arch/sparc/Kconfig
>> @@ -62,7 +62,6 @@ config SPARC32
>>  	select HAVE_UID16
>>  	select LOCK_MM_AND_FIND_VMA
>>  	select OLD_SIGACTION
>> -	select ZONE_DMA
>
> This however makes a number of PCI drivers that depend on
> ZONE_DMA unselectable.

I think that is the correct thing to do then: the only
drivers that I see with this dependency are PCI sound cards
that apparently rely on DMA to the 16MB ISA range, which is
not provided by sparc.

      Arnd