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Message-Id: <20121207005234.885301524@linuxfoundation.org>
Date: Thu, 6 Dec 2012 16:54:22 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
alan@...rguk.ukuu.org.uk,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Andi Kleen <andi@...stfloor.org>,
Tony Luck <tony.luck@...el.com>,
Andi Kleen <andi.kleen@...el.com>,
Wu Fengguang <fengguang.wu@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 07/20] mm: soft offline: split thp at the beginning of soft_offline_page()
3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
commit 783657a7dc20e5c0efbc9a09a9dd38e238a723da upstream.
When we try to soft-offline a thp tail page, put_page() is called on the
tail page unthinkingly and VM_BUG_ON is triggered in put_compound_page().
This patch splits thp before going into the main body of soft-offlining.
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Wu Fengguang <fengguang.wu@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
mm/memory-failure.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1481,9 +1481,17 @@ int soft_offline_page(struct page *page,
{
int ret;
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 (PageTransHuge(hpage)) {
+ if (PageAnon(hpage) && unlikely(split_huge_page(hpage))) {
+ pr_info("soft offline: %#lx: failed to split THP\n",
+ pfn);
+ return -EBUSY;
+ }
+ }
ret = get_any_page(page, pfn, flags);
if (ret < 0)
--
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