Messages in this thread | | | Date | Fri, 28 Feb 2003 16:05:50 +0000 | From | Russell King <> | Subject | Re: Proposal: Eliminate GFP_DMA |
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On Fri, Feb 28, 2003 at 09:44:14PM +0600, Dmitry A. Fedorov wrote: > On 28 Feb 2003, Alan Cox wrote: > > On Fri, 2003-02-28 at 14:12, Matthew Wilcox wrote: > > > i'm not the kind of person who just changes the header file and breaks all > > > the drivers. plan: > > > > > > - Add the GFP_ATOMIC_DMA & GFP_KERNEL_DMA definitions > > > - Change the drivers > > > - Delete the GFP_DMA definition > > > > Needless pain for people maintaining cross release drivers. Save it for > > 2.7 where we should finally do the honourable deed given x86-64 may well > > be mainstream, and simply remove GFP_DMA and expect people to use > > pci_* > > But why drivers of ISA bus devices with DMA should use pci_* functions? > > I'm personally wouldn't have too much pain with GFP_DMA because I have > compatibility headers and proposed change for them is tiny.
Umm, question - I've seen ISA bridges with the ability to perform 32-bit DMA using the ISA DMA controllers. AFAIK, Linux doesn't make use of this feature, except on ARM PCI systems with ISA bridges. Is there a reason why this isn't used on x86 hardware?
-- Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux http://www.arm.linux.org.uk/personal/aboutme.html
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