[merged mm-stable] mm-memory-failure-fetch-compound-head-after-extra-page-refcnt-is-held.patch removed from -mm tree

[merged mm-stable] mm-memory-failure-fetch-compound-head-after-extra-page-refcnt-is-held.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: memory-failure: fetch compound head after extra page refcnt is held
has been removed from the -mm tree.  Its filename was
     mm-memory-failure-fetch-compound-head-after-extra-page-refcnt-is-held.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm: memory-failure: fetch compound head after extra page refcnt is held
Date: Tue, 11 Jul 2023 13:50:15 +0800

Page might become thp, huge page or being splited after compound head is
fetched but before page refcnt is bumped.  So hpage might be a tail page
leading to VM_BUG_ON_PAGE(PageTail(page)) in PageTransHuge().

Link: https://lkml.kernel.org/r/20230711055016.2286677-8-linmiaohe@huawei.com
Fixes: 415c64c1453a ("mm/memory-failure: split thp earlier in memory error handling")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory-failure.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/memory-failure.c~mm-memory-failure-fetch-compound-head-after-extra-page-refcnt-is-held
+++ a/mm/memory-failure.c
@@ -2175,8 +2175,6 @@ try_again:
 		goto unlock_mutex;
 	}
 
-	hpage = compound_head(p);
-
 	/*
 	 * We need/can do nothing about count=0 pages.
 	 * 1) it's a free page, and therefore in safe hand:
@@ -2215,6 +2213,7 @@ try_again:
 		}
 	}
 
+	hpage = compound_head(p);
 	if (PageTransHuge(hpage)) {
 		/*
 		 * The flag must be set after the refcount is bumped
_

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

mm-memory-failure-fix-unexpected-return-value-in-soft_offline_page.patch
mm-memory-failure-fix-potential-page-refcnt-leak-in-memory_failure.patch
mm-memcg-fix-obsolete-function-name-in-mem_cgroup_protection.patch
mm-memory-failure-add-pageoffline-check.patch
mm-page_alloc-avoid-unneeded-alike_pages-calculation.patch
mm-memcg-update-obsolete-comment-above-parent_mem_cgroup.patch
mm-page_alloc-remove-unneeded-variable-base.patch
mm-memcg-fix-wrong-function-name-above-obj_cgroup_charge_zswap.patch
mm-memory-failure-use-helper-macro-llist_for_each_entry_safe.patch
mm-mm_init-use-helper-macro-bits_per_long-and-bits_per_byte.patch