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mm, hwpoison: set PG_hwpoison for busy hugetlb pages

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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@linux.dev
Fixes: 405ce05123 ("mm/hwpoison: fix race between hugetlb free/demotion and memory_failure_hugetlb()")
Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Naoya Horiguchi 2022-07-14 13:24:17 +09:00 committed by Andrew Morton
parent ac5fcde0a9
commit 38f6d29397
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/mm.h
View File

@ -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);

8
mm/memory-failure.c
View File

@ -1800,7 +1800,8 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
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(unsigned long pfn, int flags, int *hugetlb
struct page *p = pfn_to_page(pfn);
struct page *head;
unsigned long page_flags;
bool retry = true;
*hugetlb = 1;
retry:
@ -1843,8 +1843,8 @@ static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb
}
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);