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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-11-29 13:54:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-11-30 08:51:18 -0800
commit783657a7dc20e5c0efbc9a09a9dd38e238a723da (patch)
tree0c0d469c5d5ac18ecc89e4d7de27be652a07166f /mm/memory-failure.c
parent782fd30406ecb9d9b082816abe0c6008fc72a7b0 (diff)
downloadlinux-783657a7dc20e5c0efbc9a09a9dd38e238a723da.tar.gz
mm: soft offline: split thp at the beginning of soft_offline_page()
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@ah.jp.nec.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Andi Kleen <andi.kleen@intel.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: <stable@vger.kernel.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.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6c5899b9034..8b20278be6a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1476,9 +1476,17 @@ int soft_offline_page(struct page *page, int flags)
{
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)