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mm: shmem: only remove inode from swaplist when it's swapped page count is 0

Even if we fail to allocate a swap entry, the inode might have previously
allocated entry and we might take inode containing swap entry off
swaplist. As a result, try_to_unuse() may enter a potential dead loop to
repeatedly look for inode and clean it's swap entry. Only take inode off
swaplist when it's swapped page count is 0 to fix the issue.

Link: https://lkml.kernel.org/r/20250516170939.965736-5-shikemeng@huaweicloud.com
Fixes: b487a2da3575 ("mm, swap: simplify folio swap allocation")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Kairui Song <kasong@tencent.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202505161438.9009cf47-lkp@intel.com
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Kemeng Shi and committed by
Andrew Morton a5cdbe9f 3f778ab1

+2 -2
+2 -2
mm/shmem.c
··· 1651 1651 BUG_ON(folio_mapped(folio)); 1652 1652 return swap_writepage(&folio->page, wbc); 1653 1653 } 1654 - 1655 - list_del_init(&info->swaplist); 1654 + if (!info->swapped) 1655 + list_del_init(&info->swaplist); 1656 1656 mutex_unlock(&shmem_swaplist_mutex); 1657 1657 if (nr_pages > 1) 1658 1658 goto try_split;