From: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Date: Mon, 4 Aug 2025 14:51:17 +0000 (+0000)
Subject: mm/nommu: convert kobjsize() to folios
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=f6d8fe419f3b9186405a5468fa6e51bfa77b6950;p=users%2Fjedix%2Flinux-maple.git

mm/nommu: convert kobjsize() to folios

Simple folio conversion to remove a user of PageSlab() and PageCompound().

Link: https://lkml.kernel.org/r/20250804145117.3857308-1-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/nommu.c b/mm/nommu.c
index 6fff462f90d38..c3a23b082adb9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -64,7 +64,7 @@ const struct vm_operations_struct generic_file_vm_ops = {
  */
 unsigned int kobjsize(const void *objp)
 {
-	struct page *page;
+	struct folio *folio;
 
 	/*
 	 * If the object we have should not have ksize performed on it,
@@ -73,22 +73,22 @@ unsigned int kobjsize(const void *objp)
 	if (!objp || !virt_addr_valid(objp))
 		return 0;
 
-	page = virt_to_head_page(objp);
+	folio = virt_to_folio(objp);
 
 	/*
 	 * If the allocator sets PageSlab, we know the pointer came from
 	 * kmalloc().
 	 */
-	if (PageSlab(page))
+	if (folio_test_slab(folio))
 		return ksize(objp);
 
 	/*
-	 * If it's not a compound page, see if we have a matching VMA
+	 * If it's not a large folio, see if we have a matching VMA
 	 * region. This test is intentionally done in reverse order,
 	 * so if there's no VMA, we still fall through and hand back
-	 * PAGE_SIZE for 0-order pages.
+	 * PAGE_SIZE for 0-order folios.
 	 */
-	if (!PageCompound(page)) {
+	if (!folio_test_large(folio)) {
 		struct vm_area_struct *vma;
 
 		vma = find_vma(current->mm, (unsigned long)objp);
@@ -100,7 +100,7 @@ unsigned int kobjsize(const void *objp)
 	 * The ksize() function is only guaranteed to work for pointers
 	 * returned by kmalloc(). So handle arbitrary pointers here.
 	 */
-	return page_size(page);
+	return folio_size(folio);
 }
 
 void vfree(const void *addr)