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

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Date:	Tue, 11 Dec 2012 20:18:31 +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 2/2] MCE: fix an error of mce_bad_pages statistics

1) adjust the function structure, there are too many return points
   randomly intermingled with some "goto done" return points.
2) use atomic_long_inc instead of atomic_long_add.

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 mm/memory-failure.c |   34 ++++++++++++++++++++--------------
 1 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 9b74983..81f942d 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1421,12 +1421,13 @@ static int soft_offline_huge_page(struct page *page, int flags)

 	if (PageHWPoison(hpage)) {
 		pr_info("soft offline: %#lx hugepage already poisoned\n", pfn);
-		return -EBUSY;
+		ret = -EBUSY;
+		goto out;
 	}

 	ret = get_any_page(page, pfn, flags);
 	if (ret < 0)
-		return ret;
+		goto out;
 	if (ret == 0)
 		goto done;

@@ -1437,7 +1438,7 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	if (ret) {
 		pr_info("soft offline: %#lx: migration failed %d, type %lx\n",
 			pfn, ret, page->flags);
-		return ret;
+		goto out;
 	}
 done:
 	/* keep elevated page count for bad page */
@@ -1447,7 +1448,7 @@ done:
 	unlock_page(hpage);

 	dequeue_hwpoisoned_huge_page(hpage);
-
+out:
 	return ret;
 }

@@ -1479,24 +1480,28 @@ int soft_offline_page(struct page *page, int flags)
 	unsigned long pfn = page_to_pfn(page);
 	struct page *hpage = compound_trans_head(page);

-	if (PageHuge(page))
-		return soft_offline_huge_page(page, flags);
+	if (PageHuge(page)) {
+		ret = soft_offline_huge_page(page, flags);
+		goto out;
+	}
 	if (PageTransHuge(hpage)) {
 		if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) {
 			pr_info("soft offline: %#lx: failed to split THP\n",
 				pfn);
-			return -EBUSY;
+			ret = -EBUSY;
+			goto out;
 		}
 	}

 	if (PageHWPoison(page)) {
 		pr_info("soft offline: %#lx page already poisoned\n", pfn);
-		return -EBUSY;
+		ret = -EBUSY;
+		goto out;
 	}

 	ret = get_any_page(page, pfn, flags);
 	if (ret < 0)
-		return ret;
+		goto out;
 	if (ret == 0)
 		goto done;

@@ -1515,14 +1520,15 @@ int soft_offline_page(struct page *page, int flags)
 		 */
 		ret = get_any_page(page, pfn, 0);
 		if (ret < 0)
-			return ret;
+			goto out;
 		if (ret == 0)
 			goto done;
 	}
 	if (!PageLRU(page)) {
 		pr_info("soft_offline: %#lx: unknown non LRU page type %lx\n",
 			pfn, page->flags);
-		return -EIO;
+		ret = -EIO;
+		goto out;
 	}

 	/*
@@ -1577,14 +1583,14 @@ int soft_offline_page(struct page *page, int flags)
 			pfn, ret, page_count(page), page->flags);
 	}
 	if (ret)
-		return ret;
+		goto out;

 done:
 	/* keep elevated page count for bad page */
 	lock_page(page);
-	atomic_long_add(1, &mce_bad_pages);
+	atomic_long_inc(&mce_bad_pages);
 	SetPageHWPoison(page);
 	unlock_page(page);
-
+out:
 	return ret;
 }
-- 
1.7.1


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