+ mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch added to -mm tree

+ mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: soft-offline: return -EBUSY if set_hwpoison_free_buddy_page() fails
has been added to the -mm tree.  Its filename is
     mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch

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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Subject: mm: soft-offline: return -EBUSY if set_hwpoison_free_buddy_page() fails

The pass/fail of soft offline should be judged by checking whether the raw
error page was finally contained or not (i.e.  the result of
set_hwpoison_free_buddy_page()), but current code do not work like that. 
So this patch is suggesting to fix it.

Link: http://lkml.kernel.org/r/1560154686-18497-2-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Fixes: 6bc9b56433b76 ("mm: fix race on soft-offlining")
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Xishi Qiu <xishi.qiuxishi@alibaba-inc.com>
Cc: "Chen, Jerry T" <jerry.t.chen@intel.com>
Cc: "Zhuo, Qiuxu" <qiuxu.zhuo@intel.com>
Cc: <stable@vger.kernel.org>	[4.19+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/memory-failure.c~mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails
+++ a/mm/memory-failure.c
@@ -1730,6 +1730,8 @@ static int soft_offline_huge_page(struct
 		if (!ret) {
 			if (set_hwpoison_free_buddy_page(page))
 				num_poisoned_pages_inc();
+			else
+				ret = -EBUSY;
 		}
 	}
 	return ret;
_

Patches currently in -mm which might be from n-horiguchi@ah.jp.nec.com are

mm-soft-offline-return-ebusy-if-set_hwpoison_free_buddy_page-fails.patch
mm-hugetlb-soft-offline-dissolve_free_huge_page-return-zero-on-pagehuge.patch