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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Yu Zhao <yuzhao@google.com>, Hugh Dickins <hughd@google.com>
Subject: [PATCH v11 26/69] mm: convert vma_lookup() to use mtree_load()
Thread-Topic: [PATCH v11 26/69] mm: convert vma_lookup() to use mtree_load()
Thread-Index: AQHYmYd02Ulf+3OxjEqJPvyktcOr0Q==
Date:   Sun, 17 Jul 2022 02:46:45 +0000
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From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

Unlike the rbtree, the Maple Tree will return a NULL if there's nothing at
a particular address.

Since the previous commit dropped the vmacache, it is now possible to
consult the tree directly.

Link: https://lkml.kernel.org/r/20220504011345.662299-11-Liam.Howlett@oracl=
e.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-27-Liam.Howlett@orac=
le.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/mm.h | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 55b4b53895e8..a250fd86fde9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2809,12 +2809,7 @@ struct vm_area_struct *find_vma_intersection(struct =
mm_struct *mm,
 static inline
 struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr=
)
 {
-	struct vm_area_struct *vma =3D find_vma(mm, addr);
-
-	if (vma && addr < vma->vm_start)
-		vma =3D NULL;
-
-	return vma;
+	return mtree_load(&mm->mm_mt, addr);
 }
=20
 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
--=20
2.35.1