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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@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.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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