vmapbuf confusion

[Chuck Tuffli]

On 2/16/06, Matthew Dillon <dillon at xxxxxxxxxxxxxxxxxxxx> wrote:
>     Device drivers need a stable KVA-mapped memory.  It only seems
>     to work with the pointer to user memory because the user memory
>     happened to be faulted in for the duration of the I/O and
>     because the I/O happened to occur in the context of the user process.
>     This isn't always going to be the case with a device write.

ok, that makes sense. thanks!