+ mmhwpoison-return-ebusy-when-migration-fails.patch added to -mm tree

+ mmhwpoison-return-ebusy-when-migration-fails.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm,hwpoison: return -EBUSY when migration fails
has been added to the -mm tree.  Its filename is
     mmhwpoison-return-ebusy-when-migration-fails.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mmhwpoison-return-ebusy-when-migration-fails.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mmhwpoison-return-ebusy-when-migration-fails.patch

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------------------------------------------------------
From: Oscar Salvador <osalvador@suse.de>
Subject: mm,hwpoison: return -EBUSY when migration fails

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@suse.de>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/mm/memory-failure.c~mmhwpoison-return-ebusy-when-migration-fails
+++ a/mm/memory-failure.c
@@ -1855,11 +1855,11 @@ static int __soft_offline_page(struct pa
 			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;
_

Patches currently in -mm which might be from osalvador@suse.de are

mmhwpoison-drain-pcplists-before-bailing-out-for-non-buddy-zero-refcount-page.patch
mmhwpoison-take-free-pages-off-the-buddy-freelists.patch
mmhwpoison-take-free-pages-off-the-buddy-freelists-for-hugetlb.patch
mmhwpoison-drop-unneeded-pcplist-draining.patch
mmhwpoison-refactor-get_any_page.patch
mmhwpoison-disable-pcplists-before-grabbing-a-refcount.patch
mmhwpoison-remove-drain_all_pages-from-shake_page.patch
mmmemory_failure-always-pin-the-page-in-madvise_inject_error.patch
mmhwpoison-return-ebusy-when-migration-fails.patch
mmhugetlb-remove-unneded-initialization.patch