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

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Date:	Mon, 14 May 2012 16:55:36 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Stephane Marchesin <marcheu@...omium.org>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Airlie <airlied@...il.com>,
	Daniel Vetter <ffwll.ch@...gle.com>,
	Rob Clark <rob.clark@...aro.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/10] shmem: replace page if mapping excludes its zone

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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