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Date: Mon, 27 Jan 2003 20:49:12 +0100
From: Jens Axboe <axboe@suse.de>
To: Alan Cox <alan@redhat.com>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ross Biro <rossb@google.com>, linux-kernel@vger.kernel.org
Subject: Re: 2.4.21-pre3 kernel crash
Message-ID: <20030127194912.GI889@suse.de>
References: <1043694192.2756.55.camel@zion.wanadoo.fr> <200301271945.h0RJj7B26739@devserv.devel.redhat.com>
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On Mon, Jan 27 2003, Alan Cox 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)
> > 
> > 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.
> 
> I don't see how 2.4 IDE would be getting highmem pages. 2.5 IDE does handle
> this and does need to

?

The block-highmem patch is in the 2.4 kernels since 2.4.20-pre2/3 (I
forget which). __ide_dma_on() calls ide_toggle_bounce() which turns on
full 32-bit dma for that drive, if it's a disk. So IDE will be getting
highmem pages for io if you have them.

-- 
Jens Axboe

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