[PATCH v1 15/23] mm/balloon_compaction: assert that the balloon_pages_lock is held
From: David Hildenbrand <hidden>
Date: 2025-10-21 13:00:09
Also in:
linux-doc, linux-mm, lkml, virtualization
Subsystem:
memory management, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Let's add some sanity checks for holding the balloon_pages_lock when we're effectively inflating/deflating a page. Signed-off-by: David Hildenbrand <redacted> --- mm/balloon_compaction.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index 717bc43732d09..f6e0582bd7ffe 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c@@ -33,6 +33,7 @@ static inline struct balloon_dev_info *balloon_page_device(struct page *page) static inline void balloon_page_insert(struct balloon_dev_info *balloon, struct page *page) { + lockdep_assert_held(&balloon_pages_lock); __SetPageOffline(page); if (IS_ENABLED(CONFIG_BALLOON_COMPACTION)) { SetPageMovableOps(page);
@@ -50,6 +51,7 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon, */ static inline void balloon_page_finalize(struct page *page) { + lockdep_assert_held(&balloon_pages_lock); if (IS_ENABLED(CONFIG_BALLOON_COMPACTION)) set_page_private(page, 0); /* PageOffline is sticky until the page is freed to the buddy. */
--
2.51.0