linux-kernel - [PATCH] mm/nommu: convert kobjsize() to folios

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250731202629.3729139-1-sidhartha.kumar@oracle.com>
Date: Thu, 31 Jul 2025 20:26:29 +0000
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, willy@...radead.org,
        vbabka@...e.cz, jannh@...gle.com, pfalcato@...e.de,
        lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH] mm/nommu: convert kobjsize() to folios

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

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 mm/nommu.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 07504d666d6a..a00f8fc316c1 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 compound 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)
-- 
2.43.0