On Sat, Jul 06, 2002 at 07:50:41PM -0700, Andrew Morton wrote:

Any time you have one of these pages in use, the process gets
pinned onto the current CPU. If we run out of per-cpu kmaps,
just fall back to traditional kmap().

This is not particularly difficult, it only requires a depth counter
and a saved cpumask for when it becomes unpinned again.


Cheers,
Bill
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