linux-kernel - [RFC PATCH 4/4] mm: hwpoison: soft offline supports thp migration

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Date:   Mon, 14 Aug 2017 21:52:16 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Zi Yan <zi.yan@...rutgers.edu>
Subject: [RFC PATCH 4/4] mm: hwpoison: soft offline supports thp migration

From: Zi Yan <zi.yan@...rutgers.edu>

This patch enables thp migration for soft offline.

Signed-off-by: Zi Yan <zi.yan@...rutgers.edu>
---
 mm/memory-failure.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index c05107548d72..02ae1aff51a4 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1712,25 +1712,6 @@ static int __soft_offline_page(struct page *page, int flags, int *split)
 static int soft_offline_in_use_page(struct page *page, int flags, int *split)
 {
 	int ret;
-	struct page *hpage = compound_head(page);
-
-	if (!PageHuge(page) && PageTransHuge(hpage)) {
-		lock_page(hpage);
-		if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) {
-			unlock_page(hpage);
-			if (!PageAnon(hpage))
-				pr_info("soft offline: %#lx: non anonymous thp\n", page_to_pfn(page));
-			else
-				pr_info("soft offline: %#lx: thp split failed\n", page_to_pfn(page));
-			put_hwpoison_page(hpage);
-			return -EBUSY;
-		}
-		if (split)
-			*split = 1;
-		unlock_page(hpage);
-		get_hwpoison_page(page);
-		put_hwpoison_page(hpage);
-	}
 
 	if (PageHuge(page))
 		ret = soft_offline_huge_page(page, flags);
-- 
2.13.2