mm: remove a call to compound_head() from is_page_hwpoison()

We can call it only once instead of twice.

Link: https://lkml.kernel.org/r/20240321142448.1645400-7-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/page-flags.h

@@ -1065,11 +1065,14 @@ static inline bool PageHuge(const struct page *page)
  * best effort only and inherently racy: there is no way to synchronize with
  * failing hardware.
  */
-static inline bool is_page_hwpoison(struct page *page)
+static inline bool is_page_hwpoison(const struct page *page)
 {
+	const struct folio *folio;
+
 	if (PageHWPoison(page))
 		return true;
-	return PageHuge(page) && PageHWPoison(compound_head(page));
+	folio = page_folio(page);
+	return folio_test_hugetlb(folio) && PageHWPoison(&folio->page);
 }
 
 extern bool is_free_buddy_page(struct page *page);