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Introduce a new helper function `xe_vma_has_default_mem_attrs()` to determine whether a VMA's memory attributes are set to their default values. This includes checks for atomic access, PAT index, and preferred location. Also, add a new field `default_pat_index` to `struct xe_vma_mem_attr` to track the initial PAT index set during the first bind. This helps distinguish between default and user-modified pat index, such as those changed via madvise. Reviewed-by: Matthew Brost <matthew.brost@intel.com> Link: https://lore.kernel.org/r/20250821173104.3030148-18-himal.prasad.ghimiray@intel.com Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>