From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jes Sorensen Date: Tue, 12 Sep 2006 09:12:26 +0000 Subject: Re: [PATCH 3/6] Optional ZONE_DMA in the VM Message-Id: <450679FA.7040704@sgi.com> List-Id: References: <20060911222744.4849.26386.sendpatchset@schroedinger.engr.sgi.com> In-Reply-To: <20060911222744.4849.26386.sendpatchset@schroedinger.engr.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Andi Kleen wrote: >> So I totally agree, GFP_DMA allocations really ought to fail in this >> situation and we should fixup the users instead. > > It's just impossible to fix them without having a bounce buffer. > The only way would be to not use the hardware. I guess > we can find out how many people still use floppies and other > such hardware by having it for some time in -mm*. Actually I was somehow unclear in my mail. You are right about the 24bit zone, but there is also the issue of the 32bit zone to deal with, which is what I had in mind. This is still common, even if things like ISA and floppies are history. > But I reserve the right that if this thing becomes a FAQ - e.g. > various people set the option wrong and break their systems > to rip it out again. I'm not interested at all in patches that increase > the bogus bug report rate. Nod, I am worried if we get to a state with random bug reports or 32bit cards not working because of this. You may be able to explain it to users one at a time, but I really don't feel like spending my time doing that :) Cheers, Jes