mm/hmm: Use hmm_mirror not mm as an argument for hmm_range_register

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Ralph observes that hmm_range_register() can only be called by a driver
while a mirror is registered. Make this clear in the API by passing in the
mirror structure as a parameter.

This also simplifies understanding the lifetime model for struct hmm, as
the hmm pointer must be valid as part of a registered mirror so all we
need in hmm_register_range() is a simple kref_get.

Suggested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Philip Yang <Philip.Yang@amd.com>

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This commit is contained in:

Jason Gunthorpe 2019-05-23 09:41:19 -03:00

parent 6d7c3cde93

commit e36acfe6c8

3 changed files with 9 additions and 13 deletions

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2

drivers/gpu/drm/nouveau/nouveau_svm.c

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include/linux/hmm.h

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13

mm/hmm.c

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