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Subject: Re: 2.4.21-pre3 kernel crash
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Ross Biro <rossb@google.com>
Cc: linux-kernel@vger.kernel.org, alan@redhat.com
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Date: 27 Jan 2003 20:03:13 +0100
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On Mon, 2003-01-27 at 17:53, Ross Biro wrote:
> This looks like the same problem I ran into with IDE and highmem not 
> getting along.  Try compiling your kernel with out highmem enabled and 
> see what happenes.

Indeed, looking at the code, it seems ide_build_sglist() doesn't worry
much about highmem, just picks bh->b_data, assume it's a virtual
address, and gives that to pci_map_sg(). I beleive, at least for highmem
pages, it should rather pick bh->b_page and bh_offset(bh)

I can hack something, maybe tonight, but I can't test HIGHMEM for a while
here. Interestingly, I had no problem report on PPC from users using IDE
with highmem though.

Ben.

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