[09/13] mm: do not split a folio if it has minimum folio order requirement

Commit Message

Pankaj Raghav (Samsung) Feb. 26, 2024, 9:49 a.m. UTC

From: Pankaj Raghav <[e-mail]>

As we don't have a way to split a folio to a any given lower folio
order yet, avoid splitting the folio in split_huge_page_to_list() if it
has a minimum folio order requirement.

Signed-off-by: Pankaj Raghav <[e-mail]>
Signed-off-by: Luis Chamberlain <[e-mail]>
Reviewed-by: Hannes Reinecke <[e-mail]>
---
 mm/huge_memory.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

Patch

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 81fd1ba57088..6ec3417638a1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3030,6 +3030,19 @@  int split_huge_page_to_list(struct page *page, struct list_head *list)
 			goto out;
 		}
 
+		/*
+		 * Do not split if mapping has minimum folio order
+		 * requirement.
+		 *
+		 * XXX: Once we have support for splitting to any lower
+		 * folio order, then it could be split based on the
+		 * min_folio_order.
+		 */
+		if (mapping_min_folio_order(mapping)) {
+			ret = -EAGAIN;
+			goto out;
+		}
+
 		gfp = current_gfp_context(mapping_gfp_mask(mapping) &
 							GFP_RECLAIM_MASK);