[patch 013/192] mm/huge_memory.c: use page->deferred_list

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From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/huge_memory.c: use page->deferred_list

Now that we can represent the location of ->deferred_list instead of
->mapping + ->index, make use of it to improve readability.

Link: https://lkml.kernel.org/r/20210511134857.1581273-3-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Song Liu <songliubraving@xxxxxx>
Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/huge_memory.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/huge_memory.c~mm-huge_memoryc-use-page-deferred_list
+++ a/mm/huge_memory.c
@@ -2870,7 +2870,7 @@ static unsigned long deferred_split_scan
 	spin_lock_irqsave(&ds_queue->split_queue_lock, flags);
 	/* Take pin on all head pages to avoid freeing them under us */
 	list_for_each_safe(pos, next, &ds_queue->split_queue) {
-		page = list_entry((void *)pos, struct page, mapping);
+		page = list_entry((void *)pos, struct page, deferred_list);
 		page = compound_head(page);
 		if (get_page_unless_zero(page)) {
 			list_move(page_deferred_list(page), &list);
@@ -2885,7 +2885,7 @@ static unsigned long deferred_split_scan
 	spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags);
 
 	list_for_each_safe(pos, next, &list) {
-		page = list_entry((void *)pos, struct page, mapping);
+		page = list_entry((void *)pos, struct page, deferred_list);
 		if (!trylock_page(page))
 			goto next;
 		/* split_huge_page() removes page from list on success */
_



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