From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Wed, 10 Sep 2025 14:29:18 +0000 (+0100)
Subject: mm: remove redundant test in validate_page_before_insert()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6fd893a40e3c990ea4ca3a9c084d1ddc3020d936;p=users%2Fjedix%2Flinux-maple.git

mm: remove redundant test in validate_page_before_insert()

The page_has_type() call would have included slab since commit
46df8e73a4a3 and now we don't even get that far because slab pages have a
zero refcount since commit 9aec2fb0fd5e.

Link: https://lkml.kernel.org/r/20250910142923.2465470-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index 41e641823558..17cebb97beae 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2266,8 +2266,7 @@ static int validate_page_before_insert(struct vm_area_struct *vma,
 			return -EINVAL;
 		return 0;
 	}
-	if (folio_test_anon(folio) || folio_test_slab(folio) ||
-	    page_has_type(page))
+	if (folio_test_anon(folio) || page_has_type(page))
 		return -EINVAL;
 	flush_dcache_folio(folio);
 	return 0;