Jason Gunthorpe c7d8b7824f
hmm: use mmu_notifier_get/put for 'struct hmm' ...
This is a significant simplification, it eliminates all the remaining
'hmm' stuff in mm_struct, eliminates krefing along the critical notifier
paths, and takes away all the ugly locking and abuse of page_table_lock.
mmu_notifier_get() provides the single struct hmm per struct mm which
eliminates mm->hmm.
It also directly guarantees that no mmu_notifier op callback is callable
while concurrent free is possible, this eliminates all the krefs inside
the mmu_notifier callbacks.
The remaining krefs in the range code were overly cautious, drivers are
already not permitted to free the mirror while a range exists.
Link: https://lore.kernel.org/r/20190806231548.25242-6-jgg@ziepe.ca
Reviewed-by: Christoph Hellwig <hch@lst.de >
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com >
Tested-by: Ralph Campbell <rcampbell@nvidia.com >
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com >
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c7d8b7824f