mm/page_owner: use helper function zone_end_pfn() to get end_pfn

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.

Link: https://lkml.kernel.org/r/20210123070538.5861-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_owner.c b/mm/page_owner.c
index af464bb..d15c7c4 100644 (file)
--- 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;