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Users of hmm_vma_fault() and hmm_vma_get_pfns() provide a flags array and pfn shift value allowing them to define their own encoding for HMM pfn that are fill inside the pfns array of the hmm_range struct. With this device driver can get pfn that match their own private encoding out of HMM without having to do any conversion. [rcampbell@nvidia.com: don't ignore specific pte fault flag in hmm_vma_fault()] Link: http://lkml.kernel.org/r/20180326213009.2460-2-jglisse@redhat.com [rcampbell@nvidia.com: clarify fault logic for device private memory] Link: http://lkml.kernel.org/r/20180326213009.2460-3-jglisse@redhat.com Link: http://lkml.kernel.org/r/20180323005527.758-16-jglisse@redhat.com Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> Cc: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Mark Hairgrove <mhairgrove@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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