> Either that or somehow arrange that you'll never be passed a highmem page to
> begin with as highmem pages by their nature of not being permanently mapped
> do not _have_ a virtual address until after they're mapped.
How would you arrange so I am passed a higmem page ?
On the other hand, in my logic I have to sleep. So I can do two things
1. kmap_atomic
copy all the data and
kumap_atomic
while (not all data send)
send data using my driver ...
or
2.
while (not all data send)
{
kmap_atomic
copy only needed amount of data
kunmap_atomic
send data using my driver
}
If 2 going to be slow because of mapping / unmapping multiple times ? (1
completes buffer free logic in my driver, that's why thinging about 2.)
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