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mm/migration: remove unneeded lock page and PageMovable check

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When non-lru movable page was freed from under us, __ClearPageMovable must
have been done.  So we can remove unneeded lock page and PageMovable check
here.  Also free_pages_prepare() will clear PG_isolated for us, so we can
further remove ClearPageIsolated as suggested by David.

Link: https://lkml.kernel.org/r/20220530113016.16663-3-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-05-30 19:30:14 +08:00 committed by akpm
parent c453d8c7d1
commit 160088b3b6
1 changed files with 2 additions and 7 deletions
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9
mm/migrate.c
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@ -1090,15 +1090,10 @@ static int unmap_and_move(new_page_t get_new_page,
return -ENOSYS;
if (page_count(page) == 1) {
/* page was freed from under us. So we are done. */
/* Page was freed from under us. So we are done. */
ClearPageActive(page);
ClearPageUnevictable(page);
if (unlikely(__PageMovable(page))) {
lock_page(page);
if (!PageMovable(page))
ClearPageIsolated(page);
unlock_page(page);
}
/* free_pages_prepare() will clear PG_isolated. */
goto out;
}