mm/z3fold: throw warning on failure of trylock_page in z3fold_alloc
If trylock_page fails, the page won't be non-lru movable page. When this page is freed via free_z3fold_page, it will trigger bug on PageMovable check in __ClearPageMovable. Throw warning on failure of trylock_page to guard against such rare case just as what zsmalloc does. Link: https://lkml.kernel.org/r/20220429064051.61552-5-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1122,10 +1122,9 @@ retry:
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__SetPageMovable(page, pool->inode->i_mapping);
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__SetPageMovable(page, pool->inode->i_mapping);
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unlock_page(page);
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unlock_page(page);
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} else {
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} else {
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if (trylock_page(page)) {
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WARN_ON(!trylock_page(page));
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__SetPageMovable(page, pool->inode->i_mapping);
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__SetPageMovable(page, pool->inode->i_mapping);
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unlock_page(page);
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unlock_page(page);
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}
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}
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}
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z3fold_page_lock(zhdr);
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z3fold_page_lock(zhdr);
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