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This commit introduces a new madvise interface to support driver-specific ioctl operations. The madvise interface allows for more efficient memory management by providing hints to the driver about the expected memory usage and pte update policy for gpuvma. v2 (Matthew/Thomas) - Drop num_ops support - Drop purgeable support - Add kernel-docs - IOWR/IOW v3 (Matthew/Thomas) - Reorder attributes - use __u16 for migration_policy - use __u64 for reserved in unions - Avoid usage of vma Cc: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20250821173104.3030148-2-himal.prasad.ghimiray@intel.com Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>