From 6354c5677368ffc60047cbc00f2c379c86a1d14e Mon Sep 17 00:00:00 2001 From: Xishi Qiu Date: Wed, 20 Feb 2013 13:14:32 +1100 Subject: [PATCH] memory-failure: do code refactor of soft_offline_page() There are too many return points randomly intermingled with some "goto done" return points. So adjust the function structure, one for the success path, the other for the failure path. Use atomic_long_inc instead of atomic_long_add. Signed-off-by: Xishi Qiu Signed-off-by: Jiang Liu Suggested-by: Andrew Morton Cc: Borislav Petkov Cc: Wanpeng Li Cc: Andi Kleen Signed-off-by: Andrew Morton --- mm/memory-failure.c | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 1a9242c53315..f4c9fa1149e2 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; @@ -1437,14 +1438,14 @@ 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 */ atomic_long_add(1 << compound_trans_order(hpage), &mce_bad_pages); set_page_hwpoison_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage); - +out: return ret; } @@ -1476,24 +1477,28 @@ 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; @@ -1512,14 +1517,15 @@ 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; } /* @@ -1575,12 +1581,12 @@ 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 */ - atomic_long_add(1, &mce_bad_pages); + atomic_long_inc(&mce_bad_pages); SetPageHWPoison(page); - +out: return ret; } -- 2.39.5