linux-kernel - Re: [PATCH v2 1/3] arm64: hugetlb: Fix huge_pte_offset to return poisoned page table entries

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Date:   Wed, 7 Jun 2017 15:58:55 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Punit Agrawal <punit.agrawal@....com>
Cc:     will.deacon@....com, David Woods <dwoods@...lanox.com>,
        steve.capper@....com, tbaicar@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        manoj.iyer@...onical.com
Subject: Re: [PATCH v2 1/3] arm64: hugetlb: Fix huge_pte_offset to return
 poisoned page table entries

On Wed, May 17, 2017 at 04:23:34PM +0100, Punit Agrawal wrote:
> 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@....com>
> Acked-by: Steve Capper <steve.capper@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: David Woods <dwoods@...lanox.com>

Since the patch matches my suggestions in v1:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>