[PATCH RFC 03/29] mm/zsmalloc: drop PageIsolated() related VM_BUG_ONs
From: David Hildenbrand <hidden>
Date: 2025-06-18 17:40:29
Also in:
linux-fsdevel, linux-mm, linuxppc-dev, lkml, virtualization
Subsystem:
memory management, the rest, zsmalloc compressed slab memory allocator · Maintainers:
Andrew Morton, Linus Torvalds, Minchan Kim, Sergey Senozhatsky
Let's drop these checks; these are conditions the core migration code must make sure will hold either way, no need to double check. Signed-off-by: David Hildenbrand <redacted> --- mm/zpdesc.h | 5 ----- mm/zsmalloc.c | 5 ----- 2 files changed, 10 deletions(-)
diff --git a/mm/zpdesc.h b/mm/zpdesc.h
index d3df316e5bb7b..5cb7e3de43952 100644
--- a/mm/zpdesc.h
+++ b/mm/zpdesc.h@@ -168,11 +168,6 @@ static inline void __zpdesc_clear_zsmalloc(struct zpdesc *zpdesc) __ClearPageZsmalloc(zpdesc_page(zpdesc)); } -static inline bool zpdesc_is_isolated(struct zpdesc *zpdesc) -{ - return PageIsolated(zpdesc_page(zpdesc)); -} - static inline struct zone *zpdesc_zone(struct zpdesc *zpdesc) { return page_zone(zpdesc_page(zpdesc));
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 999b513c7fdff..7f1431f2be98f 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c@@ -1719,8 +1719,6 @@ static bool zs_page_isolate(struct page *page, isolate_mode_t mode) * Page is locked so zspage couldn't be destroyed. For detail, look at * lock_zspage in free_zspage. */ - VM_BUG_ON_PAGE(PageIsolated(page), page); - return true; }
@@ -1739,8 +1737,6 @@ static int zs_page_migrate(struct page *newpage, struct page *page, unsigned long old_obj, new_obj; unsigned int obj_idx; - VM_BUG_ON_PAGE(!zpdesc_is_isolated(zpdesc), zpdesc_page(zpdesc)); - /* The page is locked, so this pointer must remain valid */ zspage = get_zspage(zpdesc); pool = zspage->pool;
@@ -1811,7 +1807,6 @@ static int zs_page_migrate(struct page *newpage, struct page *page, static void zs_page_putback(struct page *page) { - VM_BUG_ON_PAGE(!PageIsolated(page), page); } static const struct movable_operations zsmalloc_mops = {
--
2.49.0