linux-kernel - [RFC PATCH 6/9] mm/rmap: introduce migrate_walk

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

Message-Id: <20250724084441.380404-7-link@vivo.com>
Date: Thu, 24 Jul 2025 16:44:34 +0800
From: Huan Yang <link@...o.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Rik van Riel <riel@...riel.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>,
	Xu Xin <xu.xin16@....com.cn>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Zi Yan <ziy@...dia.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Joshua Hahn <joshua.hahnjy@...il.com>,
	Rakie Kim <rakie.kim@...com>,
	Byungchul Park <byungchul@...com>,
	Gregory Price <gourry@...rry.net>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Alistair Popple <apopple@...dia.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Huan Yang <link@...o.com>,
	Christian Brauner <brauner@...nel.org>,
	Usama Arif <usamaarif642@...il.com>,
	Yu Zhao <yuzhao@...gle.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [RFC PATCH 6/9] mm/rmap: introduce migrate_walk_arg

In try_to_migrate, rmap_one as well as the done and exit hooks may
require more information from try_to_migrate to assist in performing
migration-related operations.

This patch introduces a new migrate_walk_arg structure to serve as
the arg parameter for rmap_walk_control in try_to_migrate.

Signed-off-by: Huan Yang <link@...o.com>
---
 mm/rmap.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 66b48ab192f5..2433e12c131d 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2261,6 +2261,10 @@ void try_to_unmap(struct folio *folio, enum ttu_flags flags)
 	rmap_walk(folio, &rwc);
 }
 
+struct migrate_walk_arg {
+	enum ttu_flags flags;
+};
+
 /*
  * @arg: enum ttu_flags will be passed to this argument.
  *
@@ -2276,7 +2280,8 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
 	pte_t pteval;
 	struct page *subpage;
 	struct mmu_notifier_range range;
-	enum ttu_flags flags = (enum ttu_flags)(long)arg;
+	struct migrate_walk_arg *mwa = (struct migrate_walk_arg *)arg;
+	enum ttu_flags flags = mwa->flags;
 	unsigned long pfn;
 	unsigned long hsz = 0;
 
@@ -2575,9 +2580,13 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma,
  */
 void try_to_migrate(struct folio *folio, enum ttu_flags flags)
 {
+	struct migrate_walk_arg arg = {
+		.flags = flags,
+	};
+
 	struct rmap_walk_control rwc = {
 		.rmap_one = try_to_migrate_one,
-		.arg = (void *)flags,
+		.arg = (void *)&arg,
 		.done = folio_not_mapped,
 		.locked = flags & TTU_RMAP_LOCKED,
 		.anon_lock = folio_lock_anon_vma_read,
-- 
2.34.1