linux-kernel - [Backport for 5.10.y PATCH 2/7] mm,hwpoison: return -EBUSY when migration fails

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Date:   Tue, 13 Jul 2021 17:18:32 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     <stable@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: [Backport for 5.10.y PATCH 2/7] mm,hwpoison: return -EBUSY when migration fails

From: Oscar Salvador <osalvador@...e.de>

commit 3f4b815a439adfb8f238335612c4b28bc10084d8

Currently, we return -EIO when we fail to migrate the page.

Migrations' failures are rather transient as they can happen due to
several reasons, e.g: high page refcount bump, mapping->migrate_page
failing etc.  All meaning that at that time the page could not be
migrated, but that has nothing to do with an EIO error.

Let us return -EBUSY instead, as we do in case we failed to isolate the
page.

While are it, let us remove the "ret" print as its value does not change.

Link: https://lkml.kernel.org/r/20201209092818.30417-1-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@...e.de>
Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: David Hildenbrand <david@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
---
 mm/memory-failure.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 25fb82320..01445dd 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1856,11 +1856,11 @@ static int __soft_offline_page(struct page *page)
 			pr_info("soft offline: %#lx: %s migration failed %d, type %lx (%pGp)\n",
 				pfn, msg_page[huge], ret, page->flags, &page->flags);
 			if (ret > 0)
-				ret = -EIO;
+				ret = -EBUSY;
 		}
 	} else {
-		pr_info("soft offline: %#lx: %s isolation failed: %d, page count %d, type %lx (%pGp)\n",
-			pfn, msg_page[huge], ret, page_count(page), page->flags, &page->flags);
+		pr_info("soft offline: %#lx: %s isolation failed, page count %d, type %lx (%pGp)\n",
+			pfn, msg_page[huge], page_count(page), page->flags, &page->flags);
 		ret = -EBUSY;
 	}
 	return ret;
-- 
1.7.12.4