Messages in this thread | | | Date | Mon, 27 Jan 2003 20:49:12 +0100 | From | Jens Axboe <> | Subject | Re: 2.4.21-pre3 kernel crash |
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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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