linux-kernel - [PATCH 0/2] arm64: fix two bug about page table check

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Date:   Wed, 16 Nov 2022 16:38:09 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Hildenbrand <dhildenb@...hat.com>,
        Rafael Aquini <raquini@...hat.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH 0/2] arm64: fix two bug about page table check

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(-)

-- 
2.25.1