From: Paul Mundt <lethal@linux-sh.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Christoph Lameter <clameter@sgi.com>,
linux-mm@vger.kernel.org, Nick Piggin <nickpiggin@yahoo.com.au>,
linux-ia64@vger.kernel.org, Marcelo Tosatti <marcelo@kvack.org>,
Arjan van de Ven <arjan@infradead.org>,
Martin Bligh <mbligh@google.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andi Kleen <ak@suse.de>,
linux-arch@vger.kernel.org
Subject: Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA
Date: Tue, 19 Sep 2006 00:22:43 +0900 [thread overview]
Message-ID: <20060918152243.GA4320@localhost.na.rta> (raw)
In-Reply-To: <20060918135559.GB15096@infradead.org>
On Mon, Sep 18, 2006 at 02:55:59PM +0100, Christoph Hellwig wrote:
> On Mon, Sep 11, 2006 at 03:27:39PM -0700, Christoph Lameter wrote:
> > Second, arches may use ZONE_DMA in an unknown way. We set CONFIG_ZONE_DMA
> > for all arches that do not set CONFIG_GENERIC_ISA_DMA in order to insure
> > backwards compatibility. The arches may later undefine ZONE_DMA
> > if their arch code has been verified to not depend on ZONE_DMA.
>
> Let's pass this on to linux-arch so that the arch maintainers can give input
> whether they need ZONE_DMA or not. If this just sneaks in unseen I'd bet
> various architectures will just keept it around despite not needing it.
>
sh and sh64 have no use for ZONE_DMA, it's effectively ZONE_DMA ==
ZONE_NORMAL anyways, so it can be safely switched off (though
arch/sh/mm/init.c should then be changed to use ZONE_NORMAL if ZONE_DMA
goes away, as we currently place all lowmem in ZONE_DMA, likewise for
sh64). None of our DMA controllers have any particular limitations where
ZONE_DMA would be useful at least.
next prev parent reply other threads:[~2006-09-18 15:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-18 18:36 [PATCH 0/8] Optional ZONE_DMA V2 Christoph Lameter
[not found] ` <20060911222729.4849.69497.sendpatchset@schroedinger.engr.sgi.com>
[not found] ` <20060911222739.4849.79915.sendpatchset@schroedinger.engr.sgi.com>
2006-09-18 13:55 ` [PATCH 2/6] Introduce CONFIG_ZONE_DMA Christoph Hellwig
2006-09-18 14:08 ` Martin Schwidefsky
2006-09-18 17:28 ` Christoph Lameter
2006-09-19 8:03 ` Martin Schwidefsky
2006-09-18 14:42 ` Russell King
2006-09-18 14:58 ` James Bottomley
2006-09-18 17:30 ` Christoph Lameter
2006-09-18 15:22 ` Paul Mundt [this message]
2006-09-18 17:33 ` Christoph Lameter
2006-09-18 22:45 ` Paul Mundt
2006-09-18 22:58 ` Christoph Lameter
2006-09-18 23:25 ` Paul Mundt
2006-09-18 18:36 ` [PATCH 1/8] Deal with cases of ZONE_DMA meaning the first zone Christoph Lameter
2006-09-18 18:36 ` [PATCH 2/8] Introduce CONFIG_ZONE_DMA Christoph Lameter
2006-09-18 18:36 ` [PATCH 3/8] Optional ZONE_DMA in the VM Christoph Lameter
2006-09-18 18:36 ` [PATCH 4/8] Optional ZONE_DMA for i386 Christoph Lameter
2006-09-18 18:36 ` [PATCH 5/8] Optional ZONE_DMA for x86_64 Christoph Lameter
2006-09-18 18:36 ` [PATCH 6/8] Optional ZONE_DMA for ia64 Christoph Lameter
2006-09-18 18:36 ` [PATCH 7/8] Remove ZONE_DMA remains from parisc Christoph Lameter
2006-09-18 18:36 ` [PATCH 8/8] Remove ZONE_DMA remains from sh/sh64 Christoph Lameter
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