[patch 121/192] lib/test_hmm: use vma_lookup() in dmirror_migrate()

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From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: lib/test_hmm: use vma_lookup() in dmirror_migrate()

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Link: https://lkml.kernel.org/r/20210521174745.2219620-18-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 lib/test_hmm.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/lib/test_hmm.c~lib-test_hmm-use-vma_lookup-in-dmirror_migrate
+++ a/lib/test_hmm.c
@@ -686,9 +686,8 @@ static int dmirror_migrate(struct dmirro
 
 	mmap_read_lock(mm);
 	for (addr = start; addr < end; addr = next) {
-		vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start ||
-		    !(vma->vm_flags & VM_READ)) {
+		vma = vma_lookup(mm, addr);
+		if (!vma || !(vma->vm_flags & VM_READ)) {
 			ret = -EINVAL;
 			goto out;
 		}
_



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