+ mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch added to mm-unstable branch

+ mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm, hwpoison: fix extra put_page() in soft_offline_page()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

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

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm, hwpoison: fix extra put_page() in soft_offline_page()
Date: Thu, 18 Aug 2022 21:00:13 +0800

When hwpoison_filter() refuses to soft offline a page, the page refcnt
incremented previously by MF_COUNT_INCREASED would have been consumed via
get_hwpoison_page() if ret <= 0.  So the put_ref_page() here will put the
extra one.  Remove it to fix the issue.

Link: https://lkml.kernel.org/r/20220818130016.45313-4-linmiaohe@huawei.com
Fixes: 9113eaf331bf ("mm/memory-failure.c: add hwpoison_filter for soft offline")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/memory-failure.c~mm-hwpoison-fix-extra-put_page-in-soft_offline_page
+++ a/mm/memory-failure.c
@@ -2591,8 +2591,6 @@ retry:
 	if (hwpoison_filter(page)) {
 		if (ret > 0)
 			put_page(page);
-		else
-			put_ref_page(ref_page);
 
 		mutex_unlock(&mf_mutex);
 		return -EOPNOTSUPP;
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-page_alloc-minor-clean-up-for-memmap_init_compound.patch
hugetlb_cgroup-remove-unneeded-nr_pages-0-check.patch
hugetlb_cgroup-hugetlbfs-use-helper-macro-sz_1kmg.patch
hugetlb_cgroup-remove-unneeded-return-value.patch
hugetlb_cgroup-use-helper-macro-numa_no_node.patch
hugetlb_cgroup-use-helper-for_each_hstate-and-hstate_index.patch
mm-hugetlb-fix-incorrect-update-of-max_huge_pages.patch
mm-hugetlb-fix-warn_onkobj-in-sysfs_create_group.patch
mm-hugetlb-fix-missing-call-to-restore_reserve_on_error.patch
mm-hugetlb_vmemmap-add-missing-smp_wmb-before-set_pte_at.patch
mm-hugetlb-fix-sysfs-group-leak-in-hugetlb_unregister_node.patch
mm-hugetlb-make-detecting-shared-pte-more-reliable.patch
mm-hwpoison-fix-page-refcnt-leaking-in-try_memory_failure_hugetlb.patch
mm-hwpoison-fix-page-refcnt-leaking-in-unpoison_memory.patch
mm-hwpoison-fix-extra-put_page-in-soft_offline_page.patch
mm-hwpoison-fix-possible-use-after-free-in-mf_dax_kill_procs.patch
mm-hwpoison-kill-procs-if-unmap-fails.patch
mm-hwpoison-avoid-trying-to-unpoison-reserved-page.patch