Messages in this thread | | | Date | Mon, 10 Dec 2001 09:09:49 -0800 | From | "Martin J. Bligh" <> | Subject | Re: mm question |
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>> > I was hoping for something more elegant, but I am not adverse to writing >> > my own get_free_page_from_range(). >> >> Thats not a trivial task. > > Better than giving up.. Unfortunately looking around in > linux/Documentation and drivers did not yield much in terms of > explanation. I know I can use mem_map_reserve to reserve a page but I > don't know how to get page struct from a physical address nor which lock > to use when messing with this.
If you don't have any ISA DMA going on in the system, you might consider bastardising the ZONE_DMA page range by moving the boundary up to 64Mb, then fixing the allocator not to fail back ZONE_NORMAL et al allocations to ZONE_DMA. Thus what was originally ZONE_DMA becomes a sort of ZONE_NO_DMA. Not in the slightest bit pretty, but it might be easier to implement. Depends if you ever want it to get back into the main tree, I guess ;-)
M.
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