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authorXishi Qiu <qiuxishi@huawei.com>2013-02-22 16:34:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:15 -0800
commitfa8dd8a92dccc1b29cefd7f51334285d6ed35281 (patch)
tree3fcb74a3164d9f6f9cfed8c81b526916cf2bbdfb /mm/memory-failure.c
parent0ebff32c3637e0ed551c017eb9599ac108ab36aa (diff)
downloadlinux-fa8dd8a92dccc1b29cefd7f51334285d6ed35281.tar.gz
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 <qiuxishi@huawei.com> Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
-rw-r--r--mm/memory-failure.c34
1 files changed, 20 insertions, 14 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 1a9242c5331..f4c9fa1149e 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;
}