linux-kernel - [PATCH V3 0/2] MCE: fix an error of mce_bad

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Date:	Tue, 11 Dec 2012 20:18:23 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	WuJianguo <wujianguo@...wei.com>, Xishi Qiu <qiuxishi@...wei.com>,
	Liujiang <jiang.liu@...wei.com>,
	Simon Jeons <simon.jeons@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH V3 0/2] MCE: fix an error of mce_bad_pages statistics

When we use "/sys/devices/system/memory/soft_offline_page" to offline a
*free* page, the value of mce_bad_pages will be added, and the page is set
HWPoison flag, but it is still managed by page buddy alocator.

$ cat /proc/meminfo | grep HardwareCorrupted shows the value.

If we offline the same page, the value of mce_bad_pages will be added
*again*, this means the value is incorrect now. Assume the page is
still free during this short time.

soft_offline_page()
	get_any_page()
		"else if (is_free_buddy_page(p))" branch return 0
			"goto done";
				"atomic_long_add(1, &mce_bad_pages);"

Changelog:
V3:
	-add page lock when set HWPoison flag
	-adjust the function structure
V2 and V1:
	-fix the error

Xishi Qiu (2):
  move poisoned page check at the beginning of the function
  fix the function structure

 mm/memory-failure.c |   69 ++++++++++++++++++++++++++++-----------------------
 1 files changed, 38 insertions(+), 31 deletions(-)

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