+ mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/z3fold: remove unneeded page_mapcount_reset and ClearPagePrivate
has been added to the -mm tree.  Its filename is
     mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate.patch

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------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/z3fold: remove unneeded page_mapcount_reset and ClearPagePrivate

Page->page_type and PagePrivate are not used in z3fold.  We should remove
these confusing unneeded operations.  The z3fold do these here is due to
referring to zsmalloc's migration code which does need these operations.

Link: https://lkml.kernel.org/r/20220308134311.59086-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/z3fold.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/z3fold.c~mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate
+++ a/mm/z3fold.c
@@ -420,7 +420,6 @@ static void free_z3fold_page(struct page
 		__ClearPageMovable(page);
 		unlock_page(page);
 	}
-	ClearPagePrivate(page);
 	__free_page(page);
 }
 
@@ -1635,7 +1634,6 @@ static int z3fold_page_migrate(struct ad
 	INIT_LIST_HEAD(&new_zhdr->buddy);
 	new_mapping = page_mapping(page);
 	__ClearPageMovable(page);
-	ClearPagePrivate(page);
 
 	get_page(newpage);
 	z3fold_page_lock(new_zhdr);
@@ -1655,7 +1653,6 @@ static int z3fold_page_migrate(struct ad
 
 	queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);
 
-	page_mapcount_reset(page);
 	clear_bit(PAGE_CLAIMED, &page->private);
 	put_page(page);
 	return 0;
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-shmem-make-shmem_init-return-void.patch
mm-memcg-remove-unneeded-nr_scanned.patch
mm-mremap-use-helper-mlock_future_check.patch
mm-mlock-fix-two-bugs-in-user_shm_lock.patch
mm-z3fold-declare-z3fold_mount-with-__init.patch
mm-z3fold-remove-obsolete-comment-in-z3fold_alloc.patch
mm-z3fold-minor-clean-up-for-z3fold_free.patch
mm-z3fold-remove-unneeded-page_mapcount_reset-and-clearpageprivate.patch
mm-z3fold-remove-confusing-local-variable-l-reassignment.patch
mm-z3fold-move-decrement-of-pool-pages_nr-into-__release_z3fold_page.patch
mm-z3fold-remove-redundant-list_del_init-of-zhdr-buddy-in-z3fold_free.patch
mm-z3fold-remove-unneeded-page_headless-check-in-free_handle.patch
mm-compaction-use-helper-isolation_suitable.patch
mm-migration-remove-unneeded-local-variable-mapping_locked.patch
mm-migration-remove-unneeded-out-label.patch
mm-migration-remove-unneeded-local-variable-page_lru.patch
mm-migration-fix-the-confusing-pagetranshuge-check.patch
mm-migration-use-helper-function-vma_lookup-in-add_page_for_migration.patch
mm-migration-use-helper-macro-min-in-do_pages_stat.patch
mm-migration-avoid-unneeded-nodemask_t-initialization.patch
mm-migration-remove-some-duplicated-codes-in-migrate_pages.patch
mm-migration-fix-potential-page-refcounts-leak-in-migrate_pages.patch
mm-migration-fix-potential-invalid-node-access-for-reclaim-based-migration.patch
mm-migration-fix-possible-do_pages_stat_array-racing-with-memory-offline.patch