linux-kernel - [PATCH v14 26/70] mm: convert vma_lookup() to use mtree

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Message-ID: <20220906194824.2110408-27-Liam.Howlett@oracle.com>
Date:   Tue, 6 Sep 2022 19:48:51 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Liam Howlett <liam.howlett@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH v14 26/70] mm: convert vma_lookup() to use mtree_load()

From: "Liam R. Howlett" <Liam.Howlett@...cle.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.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
 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 9ed579168f87..36d28090e8c7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2799,12 +2799,7 @@ 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 = find_vma(mm, addr);
-
-	if (vma && addr < vma->vm_start)
-		vma = NULL;
-
-	return vma;
+	return mtree_load(&mm->mm_mt, addr);
 }
 
 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
-- 
2.35.1