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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
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        Michel Lespinasse <walken.cr@gmail.com>,
        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 36/94] mm: Optimize find_exact_vma() to use vma_lookup()
Thread-Topic: [PATCH 36/94] mm: Optimize find_exact_vma() to use vma_lookup()
Thread-Index: AQHXPEQ02ick5RZhzEeid92wN7mjjA==
Date:   Wed, 28 Apr 2021 15:36:07 +0000
Message-ID: <20210428153542.2814175-37-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
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Use vma_lookup() to walk the tree to the start value requested.  If
the vma at the start does not match, then the answer is NULL and there
is no need to look at the next vma the way that find_vma() would.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 146976070fed..cf17491be249 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2733,7 +2733,7 @@ static inline unsigned long vma_pages(struct vm_area_=
struct *vma)
 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
 				unsigned long vm_start, unsigned long vm_end)
 {
-	struct vm_area_struct *vma =3D find_vma(mm, vm_start);
+	struct vm_area_struct *vma =3D vma_lookup(mm, vm_start);
=20
 	if (vma && (vma->vm_start !=3D vm_start || vma->vm_end !=3D vm_end))
 		vma =3D NULL;
--=20
2.30.2