linux-kernel - [PATCH 09/11] PageSlab: eliminate unnecessary compound

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Message-Id: <20211012180148.1669685-10-hannes@cmpxchg.org>
Date:   Tue, 12 Oct 2021 14:01:46 -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 09/11] PageSlab: eliminate unnecessary compound_head() calls in mm/slub

virt_to_head_page() implies it.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/slub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 37a4cc1e73a7..d1bd004c8c2f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3554,7 +3554,7 @@ int build_detached_freelist(struct kmem_cache *s, size_t size,
 	page = virt_to_head_page(object);
 	if (!s) {
 		/* Handle kalloc'ed objects */
-		if (unlikely(!PageSlab(compound_head(page)))) {
+		if (unlikely(!PageSlab(page))) {
 			free_nonslab_page(page, object);
 			p[size] = NULL; /* mark object processed */
 			return size;
@@ -4516,7 +4516,7 @@ size_t __ksize(const void *object)
 
 	page = virt_to_head_page(object);
 
-	if (unlikely(!PageSlab(compound_head(page)))) {
+	if (unlikely(!PageSlab(page))) {
 		WARN_ON(!PageCompound(page));
 		return page_size(page);
 	}
@@ -4536,7 +4536,7 @@ void kfree(const void *x)
 		return;
 
 	page = virt_to_head_page(x);
-	if (unlikely(!PageSlab(compound_head(page)))) {
+	if (unlikely(!PageSlab(page))) {
 		free_nonslab_page(page, object);
 		return;
 	}
-- 
2.32.0