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Message-Id: <1167327784.3281.4341.camel@laptopd505.fenrus.org> Date: Thu, 28 Dec 2006 18:43:03 +0100 From: Arjan van de Ven <arjan@...radead.org> To: Marcelo Tosatti <marcelo@...ck.org> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, olpc-devel@...top.org Subject: Re: [PATCH] introduce config option to disable DMA zone on i386 On Thu, 2006-12-28 at 15:03 -0200, Marcelo Tosatti wrote: > Hi, > > The following patch adds a config option to get rid of the DMA zone on i386. > > Architectures with devices that have no addressing limitations (eg. PPC) > already work this way. > > This is useful for custom kernel builds where the developer is certain that > there are no address limitations. > > For example, the OLPC machine contains: > > - USB devices > - no floppy > - no address limited PCI devices > - no floppy > > A unified zone simplifies VM reclaiming work, and also simplifies OOM > killer heuristics (no need to deal with OOM on the DMA zone). > > Comments? Hi, since one gets random corruption if a user gets this wrong, at least make things like floppy and all CONFIG_ISA stuff conflict with this option.... without that your patch feels like a walking time bomb... (and please include all PCI drivers that only can do 24 bit or 28bit or .. non-32bit dma as well) Greetings, Arjan van de Ven - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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