vmalloc and DMA
From: Stevie-O
Date: Thu Sep 18 2003 - 21:00:31 EST
I need to treat a large number of pages (about 128) as continuous. However, I
need to DMA to that memory from a device. The device has a built-in
scatter-gather feature, so I don't need to worry about whether the pages are
physically contiguous. Looking through LXR revealed a function called
vmalloc_32. My questions are these:
(1) Is vmalloc_32 going to stick around for a while?
(2) Is it appropriate to vmalloc_32(512<<10) and then grab the underlying
addresses for DMA?
(3) If it *is* appropriate, what's the proper way to get to those underlying
addresses? I saw a virt_to_page macro somewhere...
--
- Stevie-O
Real Programmers use COPY CON PROGRAM.EXE
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