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.comSigned-off-by: Nluofei <luofei@unicloud.com>
Reviewed-by: NMiaohe 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: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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