+ mmhwpoison-remove-stale-code.patch added to -mm tree

+ mmhwpoison-remove-stale-code.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm,hwpoison: remove stale code
has been added to the -mm tree.  Its filename is
     mmhwpoison-remove-stale-code.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mmhwpoison-remove-stale-code.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mmhwpoison-remove-stale-code.patch

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------------------------------------------------------
From: Oscar Salvador <osalvador@suse.de>
Subject: mm,hwpoison: remove stale code

Currently we call shake_page and then check whether the page is Buddy
because shake_page calls drain_all_pages, which sends pcp-pages back to
the buddy freelists, so we could have a chance to handle free pages.

get_hwpoison_page already calls drain_all_pages, and we do call
get_hwpoison_page right before coming here, so we should be on the safe
side.

Link: https://lkml.kernel.org/r/20200908075626.11976-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Oscar Salvador <osalvador@suse.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |   12 ------------
 1 file changed, 12 deletions(-)

--- a/mm/memory-failure.c~mmhwpoison-remove-stale-code
+++ a/mm/memory-failure.c
@@ -1421,18 +1421,6 @@ try_again:
 	 * walked by the page reclaim code, however that's not a big loss.
 	 */
 	shake_page(p, 0);
-	/* shake_page could have turned it free. */
-	if (!PageLRU(p) && is_free_buddy_page(p)) {
-		if (!take_page_off_buddy(p))
-			res = -EBUSY;
-
-		if (flags & MF_COUNT_INCREASED)
-			action_result(pfn, MF_MSG_BUDDY, res ? MF_IGNORED : MF_RECOVERED);
-		else
-			action_result(pfn, MF_MSG_BUDDY_2ND, res ? MF_IGNORED : MF_RECOVERED);
-
-		return res;
-	}
 
 	lock_page(p);
 
_

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

mmhwpoison-un-export-get_hwpoison_page-and-make-it-static.patch
mmhwpoison-kill-put_hwpoison_page.patch
mmhwpoison-unify-thp-handling-for-hard-and-soft-offline.patch
mmhwpoison-rework-soft-offline-for-free-pages.patch
mmhwpoison-rework-soft-offline-for-in-use-pages.patch
mmhwpoison-refactor-soft_offline_huge_page-and-__soft_offline_page.patch
mmhwpoison-return-0-if-the-page-is-already-poisoned-in-soft-offline.patch
mmhwpoison-take-free-pages-off-the-buddy-freelists.patch
mmhwpoison-refactor-madvise_inject_error.patch
mmhwpoison-drain-pcplists-before-bailing-out-for-non-buddy-zero-refcount-page.patch
mmhwpoison-drop-unneeded-pcplist-draining.patch
mmhwpoison-remove-stale-code.patch