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

Commit Message

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

From: Liam Howlett <[e-mail]>
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/[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]>
---

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

Patch

--- 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 */