[PATCH 3/7] remove putback_lru_pages() in hugepage migration context

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

This putback_lru_pages() is inserted at cf608ac19c to allow
memory compaction to count the number of migration failed pages.

But we should not do it for a hugepage because page->lru of a hugepage
is used differently from that of a normal page:

   in-use hugepage : page->lru is unlinked,
   free hugepage   : page->lru is linked to the free hugepage list,

so putting back hugepages to LRU lists collapses this rule.
We just drop this change (without any impact on memory compaction.)

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
---
 mm/memory-failure.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git v2.6.38-rc1/mm/memory-failure.c v2.6.38-rc1/mm/memory-failure.c
index 548fbd7..b4910e8 100644
--- v2.6.38-rc1/mm/memory-failure.c
+++ v2.6.38-rc1/mm/memory-failure.c
@@ -1295,7 +1295,6 @@ static int soft_offline_huge_page(struct page *page, int flags)
 	ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0,
 				true);
 	if (ret) {
-		putback_lru_pages(&pagelist);
 		pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
 			 pfn, ret, page->flags);
 		if (ret > 0)
-- 
1.7.3.4

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