The quilt patch titled
Subject: mm, hwpoison: set PG_hwpoison for busy hugetlb pages
has been removed from the -mm tree. Its filename was
mm-hwpoison-set-pg_hwpoison-for-busy-hugetlb-pages.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: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Subject: mm, hwpoison: set PG_hwpoison for busy hugetlb pages
Date: Thu, 14 Jul 2022 13:24:17 +0900
If memory_failure() fails to grab page refcount on a hugetlb page because
it's busy, it returns without setting PG_hwpoison on it. This not only
loses a chance of error containment, but breaks the rule that
action_result() should be called only when memory_failure() do any of
handling work (even if that's just setting PG_hwpoison). This
inconsistency could harm code maintainability.
So set PG_hwpoison and call hugetlb_set_page_hwpoison() for such a case.
Link: https://lkml.kernel.org/r/20220714042420.1847125-6-naoya.horiguchi@xxxxxxxxx
Fixes: 405ce051236c ("mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()")
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: kernel test robot <lkp@xxxxxxxxx>
Cc: Liu Shixin <liushixin2@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 +
mm/memory-failure.c | 8 ++++----
2 files changed, 5 insertions(+), 4 deletions(-)
--- a/include/linux/mm.h~mm-hwpoison-set-pg_hwpoison-for-busy-hugetlb-pages
+++ a/include/linux/mm.h
@@ -3176,6 +3176,7 @@ enum mf_flags {
MF_SOFT_OFFLINE = 1 << 3,
MF_UNPOISON = 1 << 4,
MF_SW_SIMULATED = 1 << 5,
+ MF_NO_RETRY = 1 << 6,
};
int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index,
unsigned long count, int mf_flags);
--- a/mm/memory-failure.c~mm-hwpoison-set-pg_hwpoison-for-busy-hugetlb-pages
+++ a/mm/memory-failure.c
@@ -1800,7 +1800,8 @@ int __get_huge_page_for_hwpoison(unsigne
count_increased = true;
} else {
ret = -EBUSY;
- goto out;
+ if (!(flags & MF_NO_RETRY))
+ goto out;
}
if (hugetlb_set_page_hwpoison(head, page)) {
@@ -1827,7 +1828,6 @@ static int try_memory_failure_hugetlb(un
struct page *p = pfn_to_page(pfn);
struct page *head;
unsigned long page_flags;
- bool retry = true;
*hugetlb = 1;
retry:
@@ -1843,8 +1843,8 @@ retry:
}
return res;
} else if (res == -EBUSY) {
- if (retry) {
- retry = false;
+ if (!(flags & MF_NO_RETRY)) {
+ flags |= MF_NO_RETRY;
goto retry;
}
action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
_
Patches currently in -mm which might be from naoya.horiguchi@xxxxxxx are
