On Wed, 1 Aug 2012, Glauber Costa wrote:

I've audited all users of get_page() in the drivers/ directory for
patterns like this. In general, they kmalloc something like a table of
entries, and then get_page() the entries. The entries are either user
pages, pages allocated by the page allocator, or physical addresses
through their pfn (in 2 cases from the vga ones...)

I took a look about some other instances where virt_to_page occurs
together with kmalloc as well, and they all seem to fall in the same
category.

The case that was notorious in the past was a scsi control structure
allocated from slab that was then written to the device via DMA. And it
was not on x86 but some esoteric platform (powerpc?),

A reference to the discussion of this issue in 2007:

http://lkml.indiana.edu/hypermail/linux/kernel/0706.3/0424.html

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