mm/hmm: Hold a mmgrab from hmm to mm

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So long as a struct hmm pointer exists, so should the struct mm it is
linked too. Hold the mmgrab() as soon as a hmm is created, and mmdrop() it
once the hmm refcount goes to zero.

Since mmdrop() (ie a 0 kref on struct mm) is now impossible with a !NULL
mm->hmm delete the hmm_hmm_destroy().

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.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>

...

This commit is contained in:

Jason Gunthorpe 2019-05-23 10:36:46 -03:00

parent e36acfe6c8

commit c8a53b2db0

3 changed files with 4 additions and 22 deletions

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3

include/linux/hmm.h

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1

kernel/fork.c

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22

mm/hmm.c

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