[PATCH 1/4] proc: Convert gather_stats to use a folio

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Replaces six calls to compound_head() with one.  Shrinks the function
from 5054 bytes to 1756 bytes in an allmodconfig build.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/proc/task_mmu.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index e8d1008a838d..5260a2788f74 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -2549,28 +2549,29 @@ struct numa_maps_private {
 static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
 			unsigned long nr_pages)
 {
+	struct folio *folio = page_folio(page);
 	int count = page_mapcount(page);
 
 	md->pages += nr_pages;
-	if (pte_dirty || PageDirty(page))
+	if (pte_dirty || folio_test_dirty(folio))
 		md->dirty += nr_pages;
 
-	if (PageSwapCache(page))
+	if (folio_test_swapcache(folio))
 		md->swapcache += nr_pages;
 
-	if (PageActive(page) || PageUnevictable(page))
+	if (folio_test_active(folio) || folio_test_unevictable(folio))
 		md->active += nr_pages;
 
-	if (PageWriteback(page))
+	if (folio_test_writeback(folio))
 		md->writeback += nr_pages;
 
-	if (PageAnon(page))
+	if (folio_test_anon(folio))
 		md->anon += nr_pages;
 
 	if (count > md->mapcount_max)
 		md->mapcount_max = count;
 
-	md->node[page_to_nid(page)] += nr_pages;
+	md->node[folio_nid(folio)] += nr_pages;
 }
 
 static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
-- 
2.43.0