linux-kernel - [PATCH v2 52/70] mm/gup: Use maple tree navigation instead of linked list

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Message-Id: <20210112161240.2024684-53-Liam.Howlett@Oracle.com>
Date:   Tue, 12 Jan 2021 11:12:22 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...gle.com>, Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jerome Glisse <jglisse@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 52/70] mm/gup: Use maple tree navigation instead of linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/gup.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index b06e2a6d90187..20392efb2d9ba 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1465,6 +1465,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 	struct vm_area_struct *vma = NULL;
 	int locked = 0;
 	long ret = 0;
+	MA_STATE(mas, &mm->mm_mt, start, start);
 
 	end = start + len;
 
@@ -1476,10 +1477,10 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 		if (!locked) {
 			locked = 1;
 			mmap_read_lock(mm);
-			vma = find_vma(mm, nstart);
+			vma = mas_find(&mas, end);
 		} else if (nstart >= vma->vm_end)
-			vma = vma->vm_next;
-		if (!vma || vma->vm_start >= end)
+			vma = mas_next(&mas, end);
+		if (!vma)
 			break;
 		/*
 		 * Set [nstart; nend) to intersection of desired address
-- 
2.28.0