linux-kernel - [PATCH v3 48/66] mm/gup: Use maple tree navigation instead of linked list

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Date:   Tue, 5 Oct 2021 01:31:04 +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>,
        David Hildenbrand <david@...hat.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        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 v3 48/66] mm/gup: Use maple tree navigation instead of linked
 list

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

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

diff --git a/mm/gup.c b/mm/gup.c
index 886d6148d3d0..f9710e475899 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1568,7 +1568,6 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 	long ret = 0;
 
 	end = start + len;
-
 	for (nstart = start; nstart < end; nstart = nend) {
 		/*
 		 * We want to fault in pages for [nstart; end) address range.
@@ -1577,10 +1576,10 @@ 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 = find_vma_intersection(mm, start, end);
 		} else if (nstart >= vma->vm_end)
-			vma = vma->vm_next;
-		if (!vma || vma->vm_start >= end)
+			vma = vma_next(mm, vma);
+		if (!vma)
 			break;
 		/*
 		 * Set [nstart; nend) to intersection of desired address
-- 
2.30.2