mm/hwpoison: add in-use hugepage hwpoison filter judgement

After successfully obtaining the reference count of the huge page, it is
still necessary to call hwpoison_filter() to make a filter judgement,
otherwise the filter hugepage will be unmaped and the related process
may be killed.

Link: https://lkml.kernel.org/r/20220223082254.2769757-1-luofei@unicloud.com
Signed-off-by: luofei <luofei@unicloud.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index f75a2ed..086ae4e 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1534,6 +1534,14 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
        lock_page(head);
        page_flags = head->flags;
 
+       if (hwpoison_filter(p)) {
+               if (TestClearPageHWPoison(head))
+                       num_poisoned_pages_dec();
+               put_page(p);
+               res = -EOPNOTSUPP;
+               goto out;
+       }
+
        /*
         * TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
         * simply disable it. In order to make it work properly, we need