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

Commit Message

Andrew Morton June 29, 2021, 2:39 a.m. UTC

From: Liam Howlett <[e-mail]>
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/[e-mail]
Signed-off-by: Liam R. Howlett <[e-mail]>
Reviewed-by: Laurent Dufour <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Acked-by: Davidlohr Bueso <[e-mail]>
Cc: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

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

Patch

--- 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;
 		}