[PATCH 09/11] PageSlab: eliminate unnecessary compound_head() calls in mm/slub

From: Johannes Weiner <hannes@cmpxchg.org>
To: linux-mm@kvack.org
Cc: Matthew Wilcox <willy@infradead.org>,
	Kent Overstreet <kent.overstreet@gmail.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
	Roman Gushchin <guro@fb.com>,
	linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: [PATCH 09/11] PageSlab: eliminate unnecessary compound_head() calls in mm/slub
Date: Tue, 12 Oct 2021 14:01:46 -0400	[thread overview]
Message-ID: <20211012180148.1669685-10-hannes@cmpxchg.org> (raw)
In-Reply-To: <20211012180148.1669685-1-hannes@cmpxchg.org>

virt_to_head_page() implies it.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.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

