Re: [PATCH 1/10] shmem: replace page if mapping excludes its zone

[Cong Wang <xiyou.wangcong@xxxxxxxxx>]

On 05/12/2012 07:59 PM, Hugh Dickins wrote:
> +	VM_BUG_ON(!PageLocked(oldpage));
> +	__set_page_locked(newpage);
> +	VM_BUG_ON(!PageUptodate(oldpage));
> +	SetPageUptodate(newpage);
> +	VM_BUG_ON(!PageSwapBacked(oldpage));
> +	SetPageSwapBacked(newpage);
> +	VM_BUG_ON(!swap_index);
> +	set_page_private(newpage, swap_index);
> +	VM_BUG_ON(!PageSwapCache(oldpage));
> +	SetPageSwapCache(newpage);
> +

Are all of these VM_BUG_ON's necessary?
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