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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
       Tom Rini <trini@kernel.crashing.org>,
       Craig Arsenault <penguin@wombat.ca>
Cc: <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.linuxppc.org>
Subject: Re: consequences of lowering "MAX_LOW_MEM"?
Date: Tue, 3 Sep 2002 22:28:23 +0200
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>I think you'll find yourself with no virtual address space left to
>do vmalloc / fixmap / kmap type stuff. Or at least you would on i386,
>I presume it's the same for ppc. Sounds like you may have left
>yourself enough space for fixmap & kmap, but any calls to vmalloc
>will probably fail ?

Yes, same problem on PPC, you'll run out of virtual space quite
quickly for vmalloc and ioremap. Stuff a video board with lots
of VRAM or any PCI card exposing large MMIO regions into your
machines and it will probably not even boot.

Ben.


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