linux-kernel - Re: [PATCH] mm/debug: Add tests validating arch page table helpers for core features

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Date:   Thu, 27 Feb 2020 11:42:33 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>, linux-riscv@...ts.infradead.org,
        Will Deacon <will@...nel.org>, linux-arch@...r.kernel.org,
        linux-s390@...r.kernel.org, x86@...nel.org,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Ingo Molnar <mingo@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-snps-arc@...ts.infradead.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Borislav Petkov <bp@...en8.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Vineet Gupta <vgupta@...opsys.com>,
        linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] mm/debug: Add tests validating arch page table helpers
 for core features



Le 27/02/2020 à 11:33, Anshuman Khandual a écrit :
> This adds new tests validating arch page table helpers for these following
> core memory features. These tests create and test specific mapping types at
> various page table levels.
> 
> * SPECIAL mapping
> * PROTNONE mapping
> * DEVMAP mapping
> * SOFTDIRTY mapping
> * SWAP mapping
> * MIGRATION mapping
> * HUGETLB mapping

For testing HUGETLB mappings, you also have to include tests of hugepd 
functions/helpers. Not all archictures have hugepage size which matches 
with page tables levels (e.g. powerpc). Those architectures use hugepd_t.

Christophe