mm: soft-offline: dissolve free hugepage if soft-offlined

Now we have code to rescue most of healthy pages from a hwpoisoned
hugepage.  So let's apply it to soft_offline_free_page too.

Link: http://lkml.kernel.org/r/1496305019-5493-6-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/memory-failure.c

@@ -1697,7 +1697,7 @@ static void soft_offline_free_page(struct page *page)
 	if (!TestSetPageHWPoison(head)) {
 		num_poisoned_pages_inc();
 		if (PageHuge(head))
-			dequeue_hwpoisoned_huge_page(head);
+			dissolve_free_huge_page(page);
 	}
 }