arm64: hugetlb: Fix huge_pte_offset to return poisoned page table entries

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When memory failure is enabled, a poisoned hugepage pte is marked as a
swap entry. huge_pte_offset() does not return the poisoned page table
entries when it encounters PUD/PMD hugepages.

This behaviour of huge_pte_offset() leads to error such as below when
munmap is called on poisoned hugepages.

[  344.165544] mm/pgtable-generic.c:33: bad pmd 000000083af00074.

Fix huge_pte_offset() to return the poisoned pte which is then
appropriately handled by the generic layer code.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Woods <dwoods@mellanox.com>
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

...

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Punit Agrawal 2017-06-08 18:25:26 +01:00 • committed by Will Deacon

parent 687644209a

commit f02ab08afb

2 changed files with 11 additions and 20 deletions

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2

arch/arm64/include/asm/pgtable.h

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31

arch/arm64/mm/hugetlbpage.c

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