Commit a06ad3c0 authored by luofei's avatar luofei Committed by Linus Torvalds
Browse files

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: default avatarluofei <luofei@unicloud.com>
Reviewed-by: default avatarMiaohe 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d1fe111f

mm/memory-failure.c

+8 −0
Original line number Diff line number Diff line
@@ -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