1 files changed, 12 insertions, 0 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index 3e07f32b94f8..0e21d3594ab6 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -419,6 +419,18 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
 	if (!hmm_vma_walk->fault)
 		return;
 
+	/*
+	 * So we not only consider the individual per page request we also
+	 * consider the default flags requested for the range. The API can
+	 * be use in 2 fashions. The first one where the HMM user coalesce
+	 * multiple page fault into one request and set flags per pfns for
+	 * of those faults. The second one where the HMM user want to pre-
+	 * fault a range with specific flags. For the latter one it is a
+	 * waste to have the user pre-fill the pfn arrays with a default
+	 * flags value.
+	 */
+	pfns = (pfns & range->pfn_flags_mask) | range->default_flags;
+
 	/* We aren't ask to do anything ... */
 	if (!(pfns & range->flags[HMM_PFN_VALID]))
 		return;