linux-kernel - [PATCH 03/18] mm: userfaultfd: use mm_counter

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Date:   Fri, 3 Nov 2023 22:01:04 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        <linux-s390@...r.kernel.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 03/18] mm: userfaultfd: use mm_counter_folio()

Use mm_counter_folio() to save one compound_head() call.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/userfaultfd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 96d9eae5c7cc..e47aa6c91ef8 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -121,10 +121,10 @@ int mfill_atomic_install_pte(pmd_t *dst_pmd,
 	}
 
 	/*
-	 * Must happen after rmap, as mm_counter() checks mapping (via
+	 * Must happen after rmap, as mm_counter_folio() checks mapping (via
 	 * PageAnon()), which is set by __page_set_anon_rmap().
 	 */
-	inc_mm_counter(dst_mm, mm_counter(page));
+	inc_mm_counter(dst_mm, mm_counter_folio(folio));
 
 	set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte);
 
-- 
2.27.0