| 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
| ||
|
Message-ID: <20250618174014.1168640-12-david@redhat.com>
Date: Wed, 18 Jun 2025 19:39:54 +0200
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
linux-doc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
virtualization@...ts.linux.dev,
linux-fsdevel@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Jerrin Shaji George <jerrin.shaji-george@...adcom.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio Pérez <eperezma@...hat.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>,
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>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
"Liam R. Howlett" <Liam.Howlett@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>,
Mike Rapoport <rppt@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Michal Hocko <mhocko@...e.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Minchan Kim <minchan@...nel.org>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Brendan Jackman <jackmanb@...gle.com>,
Johannes Weiner <hannes@...xchg.org>,
Jason Gunthorpe <jgg@...pe.ca>,
John Hubbard <jhubbard@...dia.com>,
Peter Xu <peterx@...hat.com>,
Xu Xin <xu.xin16@....com.cn>,
Chengming Zhou <chengming.zhou@...ux.dev>,
Miaohe Lin <linmiaohe@...wei.com>,
Naoya Horiguchi <nao.horiguchi@...il.com>,
Oscar Salvador <osalvador@...e.de>,
Rik van Riel <riel@...riel.com>,
Harry Yoo <harry.yoo@...cle.com>,
Qi Zheng <zhengqi.arch@...edance.com>,
Shakeel Butt <shakeel.butt@...ux.dev>
Subject: [PATCH RFC 11/29] mm/migrate: move movable_ops page handling out of move_to_new_folio()
Let's move that handling directly into migrate_folio_move(), so we can
simplify move_to_new_folio(). While at it, fixup the documentation a
bit.
Note that unmap_and_move_huge_page() does not care, because it only
deals with actual folios. (we only support migration of
individual movable_ops pages)
Signed-off-by: David Hildenbrand <david@...hat.com>
---
mm/migrate.c | 61 ++++++++++++++++++++++++----------------------------
1 file changed, 28 insertions(+), 33 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 456e41dad83a2..db807f9bbf975 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1024,11 +1024,12 @@ static int fallback_migrate_folio(struct address_space *mapping,
}
/*
- * Move a page to a newly allocated page
- * The page is locked and all ptes have been successfully removed.
+ * Move a src folio to a newly allocated dst folio.
*
- * The new page will have replaced the old page if this function
- * is successful.
+ * The src and dst folios are locked and the src folios was unmapped from
+ * the page tables.
+ *
+ * On success, the src folio was replaced by the dst folio.
*
* Return value:
* < 0 - error code
@@ -1037,34 +1038,30 @@ static int fallback_migrate_folio(struct address_space *mapping,
static int move_to_new_folio(struct folio *dst, struct folio *src,
enum migrate_mode mode)
{
+ struct address_space *mapping = folio_mapping(src);
int rc = -EAGAIN;
- bool is_lru = !__folio_test_movable(src);
VM_BUG_ON_FOLIO(!folio_test_locked(src), src);
VM_BUG_ON_FOLIO(!folio_test_locked(dst), dst);
- if (likely(is_lru)) {
- struct address_space *mapping = folio_mapping(src);
-
- if (!mapping)
- rc = migrate_folio(mapping, dst, src, mode);
- else if (mapping_inaccessible(mapping))
- rc = -EOPNOTSUPP;
- else if (mapping->a_ops->migrate_folio)
- /*
- * Most folios have a mapping and most filesystems
- * provide a migrate_folio callback. Anonymous folios
- * are part of swap space which also has its own
- * migrate_folio callback. This is the most common path
- * for page migration.
- */
- rc = mapping->a_ops->migrate_folio(mapping, dst, src,
- mode);
- else
- rc = fallback_migrate_folio(mapping, dst, src, mode);
+ if (!mapping)
+ rc = migrate_folio(mapping, dst, src, mode);
+ else if (mapping_inaccessible(mapping))
+ rc = -EOPNOTSUPP;
+ else if (mapping->a_ops->migrate_folio)
+ /*
+ * Most folios have a mapping and most filesystems
+ * provide a migrate_folio callback. Anonymous folios
+ * are part of swap space which also has its own
+ * migrate_folio callback. This is the most common path
+ * for page migration.
+ */
+ rc = mapping->a_ops->migrate_folio(mapping, dst, src,
+ mode);
+ else
+ rc = fallback_migrate_folio(mapping, dst, src, mode);
- if (rc != MIGRATEPAGE_SUCCESS)
- goto out;
+ if (rc == MIGRATEPAGE_SUCCESS) {
/*
* For pagecache folios, src->mapping must be cleared before src
* is freed. Anonymous folios must stay anonymous until freed.
@@ -1074,10 +1071,7 @@ static int move_to_new_folio(struct folio *dst, struct folio *src,
if (likely(!folio_is_zone_device(dst)))
flush_dcache_folio(dst);
- } else {
- rc = migrate_movable_ops_page(&dst->page, &src->page, mode);
}
-out:
return rc;
}
@@ -1328,20 +1322,21 @@ static int migrate_folio_move(free_folio_t put_new_folio, unsigned long private,
int rc;
int old_page_state = 0;
struct anon_vma *anon_vma = NULL;
- bool is_lru = !__folio_test_movable(src);
struct list_head *prev;
__migrate_folio_extract(dst, &old_page_state, &anon_vma);
prev = dst->lru.prev;
list_del(&dst->lru);
+ if (unlikely(__folio_test_movable(src))) {
+ rc = migrate_movable_ops_page(&dst->page, &src->page, mode);
+ goto out_unlock_both;
+ }
+
rc = move_to_new_folio(dst, src, mode);
if (rc)
goto out;
- if (unlikely(!is_lru))
- goto out_unlock_both;
-
/*
* When successful, push dst to LRU immediately: so that if it
* turns out to be an mlocked page, remove_migration_ptes() will
--
2.49.0
Powered by blists - more mailing lists