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@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 6d2a0119fc58ef5755e5e88e2f9f0036aa68dc31..a76b3835251dfb5ca2b1a89f893d6a4f8597f21e 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2870,7 +2870,7 @@ static unsigned long deferred_split_scan(struct shrinker *shrink,
        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(struct shrinker *shrink,
        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 */