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Date:   Mon, 6 Jul 2020 06:41:42 +0530
From:   Anshuman Khandual <>
Cc:     Jonathan Corbet <>,
        Andrew Morton <>,
        Mike Rapoport <>,
        Vineet Gupta <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Benjamin Herrenschmidt <>,
        Paul Mackerras <>,
        Michael Ellerman <>,
        Heiko Carstens <>,
        Vasily Gorbik <>,
        Christian Borntraeger <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        "H. Peter Anvin" <>,
        "Kirill A . Shutemov" <>,
        Paul Walmsley <>,
        Palmer Dabbelt <>,,,,,,,,,, Zi Yan <>,
        Gerald Schaefer <>,
        Christophe Leroy <>,
        Christophe Leroy <>
Subject: Re: [PATCH V4 0/4] mm/debug_vm_pgtable: Add some more tests

On 07/06/2020 06:18 AM, Anshuman Khandual wrote:
> This series adds some more arch page table helper validation tests which
> are related to core and advanced memory functions. This also creates a
> documentation, enlisting expected semantics for all page table helpers as
> suggested by Mike Rapoport previously (
> ifdefs scattered across the test. But consolidating all the fallback stubs
> is not very straight forward because ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD is
> not explicitly dependent on ARCH_HAS_TRANSPARENT_HUGEPAGE.
> Tested on arm64, x86 platforms but only build tested on all other enabled
> platforms through ARCH_HAS_DEBUG_VM_PGTABLE i.e powerpc, arc, s390. The
> following failure on arm64 still exists which was mentioned previously. It
> will be fixed with the upcoming THP migration on arm64 enablement series.
> WARNING .... mm/debug_vm_pgtable.c:860 debug_vm_pgtable+0x940/0xa54
> WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))))
> This series is based on v5.8-rc4.
> Changes in V4:
> - Replaced READ_ONCE() with ptep_get() while accessing PTE pointers per Christophe
> - Fixed function argument alignments per Christophe

+Cc - Zi Yan, Gerald Schaefer, Christophe Leroy

The Cc list was not complete. Please do let me know if you could
not retrieve all the four patches of the series from the list.

- Anshuman

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