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SubjectRe: 2.4.21-pre3 kernel crash
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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