linux-kernel - [PATCH 10/11] PageSlab: eliminate unnecessary compound

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Message-Id: <20211012180148.1669685-11-hannes@cmpxchg.org>
Date:   Tue, 12 Oct 2021 14:01:47 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     linux-mm@...ck.org
Cc:     Matthew Wilcox <willy@...radead.org>,
        Kent Overstreet <kent.overstreet@...il.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, Roman Gushchin <guro@...com>,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: [PATCH 10/11] PageSlab: eliminate unnecessary compound_head() call in mm/usercopy

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/usercopy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 924e236522da..b3de3c4eefba 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -235,7 +235,7 @@ static inline void check_heap_object(const void *ptr, unsigned long n,
 	 */
 	page = compound_head(kmap_to_page((void *)ptr));
 
-	if (PageSlab(compound_head(page))) {
+	if (PageSlab(page)) {
 		/* Check slab allocator for flags and size. */
 		__check_heap_object(ptr, n, page, to_user);
 	} else {
-- 
2.32.0