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Message-ID: <454A1D82.7040709@cfl.rr.com> Date: Thu, 02 Nov 2006 11:32:02 -0500 From: Phillip Susi <psusi@....rr.com> To: Jun Sun <jsun@...sun.net> CC: linux-kernel@...r.kernel.org Subject: Re: Can Linux live without DMA zone? Shouldn't only ancient ISA drivers be using GFP_DMA? You know, ones that actually require it? PCI drivers should not have this limit. Jun Sun wrote: > I am trying to reserve a block of memory (>16MB) starting from 0 and hide it > from kernel. A consequence is that DMA zone now has size 0. That causes > many drivers to grief (OOMs). > > I see two ways out: > > 1. Modify individual drivers and convince them not to alloc with GFP_DMA. > I have been trying to do this but do not seem to see an end of it. :) > > 2. Simply lie and increase MAX_DMA_ADDRESS to really big (like 1GB) so that > the whole memory region belongs to DMA zone. > > #2 sounds pretty hackish. I am sure something bad will happen > sooner or later (like what?). But so far it appears to be working fine. > > The fundamental question is: Has anybody tried to run Linux without 0 sized > DMA zone before? Am I doing something that nobody has done before (which is > something really hard to believe these days with Linux :P)? > > Cheers. > > Jun - 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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