linux-kernel - Re: [PATCH v2 3/5] mm/hwpoison: introduce put_hwpoison_page to put refcount for memory error handling

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Message-Id: <20150811162449.77212ec2a80258f5aff8a224@linux-foundation.org>
Date:	Tue, 11 Aug 2015 16:24:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wanpeng Li <wanpeng.li@...mail.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] mm/hwpoison: introduce put_hwpoison_page to put
 refcount for memory error handling

On Mon, 10 Aug 2015 19:28:21 +0800 Wanpeng Li <wanpeng.li@...mail.com> wrote:

> Introduce put_hwpoison_page to put refcount for memory 
> error handling. 
> 
> ...
>
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -922,6 +922,27 @@ int get_hwpoison_page(struct page *page)
>  }
>  EXPORT_SYMBOL_GPL(get_hwpoison_page);
>  
> +/**
> + * put_hwpoison_page() - Put refcount for memory error handling:
> + * @page:	raw error page (hit by memory error)
> + */
> +void put_hwpoison_page(struct page *page)
> +{
> +	struct page *head = compound_head(page);
> +
> +	if (PageHuge(head)) {
> +		put_page(head);
> +		return;
> +	}
> +
> +	if (PageTransHuge(head))
> +		if (page != head)
> +			put_page(head);
> +
> +	put_page(page);
> +}
> +EXPORT_SYMBOL_GPL(put_hwpoison_page);

I don't believe the export is needed?
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