linux-kernel - [PATCH v4 58/66] mm/mremap: Use vma_find() instead of vma linked list

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Message-ID: <20211201142918.921493-59-Liam.Howlett@oracle.com>
Date:   Wed, 1 Dec 2021 14:30:16 +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:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.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>,
        Michel Lespinasse <walken.cr@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Minchan Kim <minchan@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Rom Lemarchand <romlem@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH v4 58/66] mm/mremap: Use vma_find() instead of vma linked list

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

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/mremap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/mremap.c b/mm/mremap.c
index b09e107cd18b..4ad39c985d04 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -713,7 +713,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
 	if (excess) {
 		vma->vm_flags |= VM_ACCOUNT;
 		if (split)
-			vma->vm_next->vm_flags |= VM_ACCOUNT;
+			find_vma(mm, vma->vm_end)->vm_flags |= VM_ACCOUNT;
 	}
 
 	return new_addr;
@@ -869,9 +869,11 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len,
 static int vma_expandable(struct vm_area_struct *vma, unsigned long delta)
 {
 	unsigned long end = vma->vm_end + delta;
+	struct vm_area_struct *next;
 	if (end < vma->vm_end) /* overflow */
 		return 0;
-	if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */
+	next = find_vma(vma->vm_mm, vma->vm_end);
+	if (next && next->vm_start < end) /* intersection */
 		return 0;
 	if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start,
 			      0, MAP_FIXED) & ~PAGE_MASK)
-- 
2.30.2