diff mbox series

[07/11] PageSlab: eliminate unnecessary compound_head() call in mm/slab

Message ID 20211012180148.1669685-8-hannes@cmpxchg.org (mailing list archive)
State New
Headers show
Series PageSlab: eliminate unnecessary compound_head() calls | expand

Commit Message

Johannes Weiner Oct. 12, 2021, 6:01 p.m. UTC 
kmem_freepages() is only ever called on the full slab, i.e. the
headpage. Further, after the PageSlab() check, the callsite continues
with a series of operations that are not legal on tailpages and would
trigger asserts on their own already.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/slab.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/slab.c b/mm/slab.c
index 829f2b6d4af7..d0f725637663 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1396,7 +1396,7 @@  static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
 {
 	int order = cachep->gfporder;
 
-	BUG_ON(!PageSlab(compound_head(page)));
+	BUG_ON(!PageSlab(page));
 	__ClearPageSlabPfmemalloc(page);
 	__ClearPageSlab(page);
 	page_mapcount_reset(page);