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From: Gerd Knorr <kraxel@bytesex.org>
Newsgroups: lists.linux.kernel
Subject: Re: [never mind] kiobufs and highmem
Date: 23 Jul 2002 11:17:33 GMT
Organization: SuSE Labs, =?ISO-8859-1?Q?Au=DFenstelle?= Berlin
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>  This should work. If you have highmem pages and your device can't
>  handle >32-bit physical addresses, then kmap() them
>  before pci_map_sg()ing them and kunmap() them after
>  pci_unmap_sg()ing.

--verbose please, I don't see how kmap() will fix the 32-bit limit issue.

As far I know kmap() doesn't move the page in physical memory, but
creates a virtual mapping for it.  Thus the kernel (i.e. the CPU) can
access it, but PCI busmasters still can't ...

  Gerd

-- 
You can't please everybody.  And usually if you _try_ to please
everybody, the end result is one big mess.
				-- Linus Torvalds, 2002-04-20
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