Messages in this thread | | | Subject | Re: locking user memory and kiobuf | Date | Mon, 8 Nov 1999 16:26:28 +0000 (GMT) | From | Alan Cox <> |
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> kiobuf sounds perfect for a problem we have. Currently I use mmap() to map > pages from __get_free_pages() into user space for dma. This is not totally > satisfactory, tho, in part because the resulting group of pages is not mapped > contiguously into kernel.
If you have a situation where that is hard to handle you can vmalloc a block of memory then map that into user space. drivers/char/bttv.c does it. Its ugly and bttv needs to switch to kiovecs in 2.3.x if I get time.
> Since we're going to ship a driver to customers, we can't use kiobuf unless > it is standard part of the kernel.
Whose kernel 8)
> So, has kiobuf been accepted into the kernel proper or will it be a patch > for the forseeable future?
Its in several vendor shipped kernels and in 2.2ac but not in 2.2 vanilla and since its not a bug fix isnt likely to be
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