[patch 123/192] mm/migrate: use vma_lookup() in do_pages_stat_array()

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From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: mm/migrate: use vma_lookup() in do_pages_stat_array()

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/20210521174745.2219620-20-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>
---

 mm/migrate.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/migrate.c~mm-migrate-use-vma_lookup-in-do_pages_stat_array
+++ a/mm/migrate.c
@@ -1834,8 +1834,8 @@ static void do_pages_stat_array(struct m
 		struct page *page;
 		int err = -EFAULT;
 
-		vma = find_vma(mm, addr);
-		if (!vma || addr < vma->vm_start)
+		vma = vma_lookup(mm, addr);
+		if (!vma)
 			goto set_status;
 
 		/* FOLL_DUMP to ignore special (like zero) pages */
_



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