[PATCH 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 0/2] arm64: fix two bug about page table check
Date: Wed, 16 Nov 2022 16:38:09 +0800	[thread overview]
Message-ID: <20221116083811.464678-1-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.                                                     

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(-)

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2.25.1