iommu/amd: Implement mmu_notifier_release call-back
Since mmu_notifier call-backs can sleep (because they use SRCU now) we can use them to tear down PASID mappings. This allows us to finally remove the hack to use the task_exit notifier from oprofile to get notified when a process dies. Signed-off-by: Joerg Roedel <jroedel@suse.de> Tested-by: Jay Cornwall <Jay.Cornwall@amd.com>
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