[PATCH] mm/page_owner: Use helper function zone_end_pfn() to get end_pfn

[Miaohe Lin]

Commit 108bcc96ef70 ("mm: add & use zone_end_pfn() and zone_spans_pfn()")
introduced the helper zone_end_pfn() to calculate the zone end pfn. But
pagetypeinfo_showmixedcount_print forgot to use it. And the initialization
of local variable pfn is duplicated, remove one.

Signed-off-by: Miaohe Lin <linmia...@huawei.com>
---
 mm/page_owner.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index af464bb7fbe7..d15c7c4994f5 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -263,8 +263,8 @@ void pagetypeinfo_showmixedcount_print(struct seq_file *m,
        struct page *page;
        struct page_ext *page_ext;
        struct page_owner *page_owner;
-       unsigned long pfn = zone->zone_start_pfn, block_end_pfn;
-       unsigned long end_pfn = pfn + zone->spanned_pages;
+       unsigned long pfn, block_end_pfn;
+       unsigned long end_pfn = zone_end_pfn(zone);
        unsigned long count[MIGRATE_TYPES] = { 0, };
        int pageblock_mt, page_mt;
        int i;
-- 
2.19.1