[I'm not a driver or pci/dma person either, so I can't usefully answer most of your questions, I'm afraid] Hugh Dickins wrote:
Is there any chance that your split_page() work in -mm, actually addresses precisely those places that were screwed up by universal compound pages? So that with your split_page(), we could go back to every >0-order page being PageCompound, without any need for __GFP_COMP.
I think it should catch most of the places [I'm sure I've missed some :(] that split up higher-order pages (which doesn't work on compound pages, I guess this was the problem). It makes like difficult for some future patch of mine if the refcounting mechanism is changed while the page is allocated (eg. like PageReserved used to do), however I think it wouldn't be too hard to instead invert the meaning of the flag and just use it in those few places that care? -- SUSE Labs, Novell Inc.Send instant messages to your online friends http://au.messenger.yahoo.com -
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