linux-kernel - [PATCH 04/11] PageSlab: eliminate unnecessary compound

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Date:   Tue, 12 Oct 2021 14:01:41 -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 04/11] PageSlab: eliminate unnecessary compound_head() calls in mm/debug

head is resolved at the beginning of the function.

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

diff --git a/mm/debug.c b/mm/debug.c
index 500f5adce00e..fae0f81ad831 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -84,7 +84,7 @@ static void __dump_page(struct page *page)
 	 * page->_mapcount space in struct page is used by sl[aou]b pages to
 	 * encode own info.
 	 */
-	mapcount = PageSlab(compound_head(head)) ? 0 : page_mapcount(page);
+	mapcount = PageSlab(head) ? 0 : page_mapcount(page);
 
 	pr_warn("page:%p refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
 			page, page_ref_count(head), mapcount, mapping,
-- 
2.32.0