[PATCH] mm: correct stale comment of function check_pte

[Kemeng Shi]

Commit 2aff7a4755bed ("mm: Convert page_vma_mapped_walk to work on PFNs")
replaced page with pfns in page_vma_mapped_walk structure and updated
"@pvmw->page" to "@pvmw->pfn" in comment of function page_vma_mapped_walk.

This patch update stale "page" to "pfn" in comment of check_pte.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
---
 mm/page_vma_mapped.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index 6ac795a87279..dbe2418b44e5 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -73,20 +73,22 @@ static bool map_pte(struct page_vma_mapped_walk *pvmw, spinlock_t **ptlp)
 }
 
 /**
- * check_pte - check if @pvmw->page is mapped at the @pvmw->pte
- * @pvmw: page_vma_mapped_walk struct, includes a pair pte and page for checking
+ * check_pte - check if [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages) is
+ * mapped at the @pvmw->pte
+ * @pvmw: page_vma_mapped_walk struct, includes a pair pte and pfn range
+ * for checking
  *
- * page_vma_mapped_walk() found a place where @pvmw->page is *potentially*
+ * page_vma_mapped_walk() found a place where pfn range is *potentially*
  * mapped. check_pte() has to validate this.
  *
  * pvmw->pte may point to empty PTE, swap PTE or PTE pointing to
  * arbitrary page.
  *
  * If PVMW_MIGRATION flag is set, returns true if @pvmw->pte contains migration
- * entry that points to @pvmw->page or any subpage in case of THP.
+ * entry that points to [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages)
  *
  * If PVMW_MIGRATION flag is not set, returns true if pvmw->pte points to
- * pvmw->page or any subpage in case of THP.
+ * [pvmw->pfn, @pvmw->pfn + @pvmw->nr_pages)
  *
  * Otherwise, return false.
  *
-- 
2.30.0