linux-kernel - [PATCH] mm/smaps: Use vma->vm_pgoff directly when counting partial swap

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Message-Id: <20210916215839.95177-1-peterx@redhat.com>
Date:   Thu, 16 Sep 2021 17:58:39 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     peterx@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Hugh Dickins <hughd@...gle.com>
Subject: [PATCH] mm/smaps: Use vma->vm_pgoff directly when counting partial swap

linear_page_index(vma, vma->vm_start) of a shmem vma is exactly vm_pgoff.

Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 mm/shmem.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 96ccf6e941aa..2aef5b8e17c9 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -856,8 +856,7 @@ unsigned long shmem_swap_usage(struct vm_area_struct *vma)
 		return swapped << PAGE_SHIFT;
 
 	/* Here comes the more involved part */
-	return shmem_partial_swap_usage(mapping,
-			linear_page_index(vma, vma->vm_start),
+	return shmem_partial_swap_usage(mapping, vma->vm_pgoff,
 			linear_page_index(vma, vma->vm_end));
 }
 
-- 
2.31.1