linux-kernel - Re: [PATCH V2] MCE: fix an error of mce_bad

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Date:	Fri, 7 Dec 2012 23:41:10 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Xishi Qiu <qiuxishi@...wei.com>, WuJianguo <wujianguo@...wei.com>,
	Liujiang <jiang.liu@...wei.com>, Vyacheslav.Dubeyko@...wei.com,
	andi@...stfloor.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] MCE: fix an error of mce_bad_pages statistics

On Fri, Dec 07, 2012 at 02:11:02PM -0800, Andrew Morton wrote:
> A few things:
> 
> - soft_offline_page() already checks for this case:
> 
> 	if (PageHWPoison(page)) {
> 		unlock_page(page);
> 		put_page(page);
> 		pr_info("soft offline: %#lx page already poisoned\n", pfn);
> 		return -EBUSY;
> 	}

Oh, so we do this check after all. But later in the function. Why? Why
not at the beginning so that when a page is marked poisoned already we
can exit early?

Strange.

-- 
Regards/Gruss,
    Boris.
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