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Date: Mon, 27 Jan 2003 20:25:28 +0100
From: Jens Axboe <axboe@suse.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Ross Biro <rossb@google.com>
Cc: linux-kernel@vger.kernel.org, alan@redhat.com
Subject: Re: 2.4.21-pre3 kernel crash
Message-ID: <20030127192528.GF889@suse.de>
References: <Pine.OSF.4.51.0301271632230.49659@tao.natur.cuni.cz> <3E356403.9010805@google.com> <1043694192.2756.55.camel@zion.wanadoo.fr>
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On Mon, Jan 27 2003, Benjamin Herrenschmidt wrote:
> 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)

Exactly, just take a look at 2.4.20.

> 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.

Then noone is using highmem on ppc with 2.4.21-pre yet, it will
definitely barf on the very first highmem bh->b_page

-- 
Jens Axboe

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