+ mm-hwpoison-dump-page-for-unhandlable-page.patch added to -mm tree

+ mm-hwpoison-dump-page-for-unhandlable-page.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm: hwpoison: dump page for unhandlable page
has been added to the -mm tree.  Its filename is
     mm-hwpoison-dump-page-for-unhandlable-page.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-dump-page-for-unhandlable-page.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-dump-page-for-unhandlable-page.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Yang Shi <shy828301@gmail.com>
Subject: mm: hwpoison: dump page for unhandlable page

Currently just very simple message is shown for unhandlable page, e.g.
non-LRU page, like:
soft_offline: 0x1469f2: unknown non LRU page type 5ffff0000000000 ()

It is not very helpful for further debug, calling dump_page() could show
more useful information.

Calling dump_page() in get_any_page() in order to not duplicate the call
in a couple of different places.  It may be called with pcp disabled and
holding memory hotplug lock, it should be not a big deal since hwpoison
handler is not called very often.

Link: https://lkml.kernel.org/r/20210819054116.266126-3-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Mackey <tdmackey@twitter.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

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

--- a/mm/memory-failure.c~mm-hwpoison-dump-page-for-unhandlable-page
+++ a/mm/memory-failure.c
@@ -1228,6 +1228,9 @@ try_again:
 		ret = -EIO;
 	}
 out:
+	if (ret == -EIO)
+		dump_page(p, "hwpoison: unhandlable page");
+
 	return ret;
 }
 
_

Patches currently in -mm which might be from shy828301@gmail.com are

revert-mm-shmem-fix-shmem_swapin-race-with-swapoff.patch
revert-mm-swap-check-if-swap-backing-device-is-congested-or-not.patch
mm-hwpoison-dont-drop-slab-caches-for-offlining-non-lru-page.patch
doc-hwpoison-correct-the-support-for-hugepage.patch
mm-hwpoison-dump-page-for-unhandlable-page.patch