mm/hmm: Poison hmm_range during unregister

Trying to misuse a range outside its lifetime is a kernel bug. Use poison
bytes to help detect this condition. Double unregister will reliably crash.

Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Jérôme Glisse <[email protected]>
Reviewed-by: John Hubbard <[email protected]>
Acked-by: Souptick Joarder <[email protected]>
Reviewed-by: Ralph Campbell <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Tested-by: Philip Yang <[email protected]>

0 files changed, 0 insertions, 0 deletions