mm/hmm: Poison hmm_range during unregister

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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 <jgg@mellanox.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Tested-by: Philip Yang <Philip.Yang@amd.com>

...

This commit is contained in:

Jason Gunthorpe 2019-05-23 11:40:24 -03:00

parent 187229c2dd

commit 2dcc3eb8ab

1 changed files with 8 additions and 6 deletions

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mm/hmm.c

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