[PATCH v2 0/2] arm64: fix two bug about page table check

From: Liu Shixin <liushixin2@huawei.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Kefeng Wang <wangkefeng.wang@huawei.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	David Hildenbrand <dhildenb@redhat.com>,
	Rafael Aquini <raquini@redhat.com>,
	Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Liu Shixin <liushixin2@huawei.com>
Subject: [PATCH v2 0/2] arm64: fix two bug about page table check
Date: Thu, 17 Nov 2022 15:56:00 +0800	[thread overview]
Message-ID: <20221117075602.2904324-1-liushixin2@huawei.com> (raw)

Denys Vlasenko has reported two bug about page table check on arm64.
On arm64, pmd_present() contains non-leaf pmd and invalid pmd too.

When collapse hugepage, the pmd is non-leaf and should skip the check.
Use pmd_leaf() instead of pmd_present().

When split hugepage, the pmd will be marked as invalid and then populate.
So we should decrease file_map_count when invalid pmd and then increase
when populate the pmd. Add pmd_valid() check.

v1->v2: Update comment and optimize the code by moving p?d_valid() at
	first place suggested by Mark.

Liu Shixin (2):
  arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud
  arm64/mm: fix incorrect file_map_count for invalid pmd/pud

 arch/arm64/include/asm/pgtable.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

-- 
2.25.1

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