From: Stevie-O <oliver@klozoff.com>
To: linux-kernel@vger.kernel.org
Subject: vmalloc and DMA
Date: Thu, 18 Sep 2003 21:54:49 -0400 [thread overview]
Message-ID: <3F6A61E9.1060407@klozoff.com> (raw)
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
next reply other threads:[~2003-09-19 1:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 1:54 Stevie-O [this message]
2003-09-19 9:05 ` Alan Cox
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