linux-kernel - Re: [PATCH V3 0/2] mm/debug: Add tests for architecture exported page table helpers

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Message-Id: <20190924123146.GC5202@linux.ibm.com>
Date:   Tue, 24 Sep 2019 15:31:47 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Anshuman Khandual <anshuman.khandual@....com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Steven Price <Steven.Price@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Matthew Wilcox <willy@...radead.org>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vineet Gupta <vgupta@...opsys.com>,
        James Hogan <jhogan@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        linux-snps-arc@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 0/2] mm/debug: Add tests for architecture exported
 page table helpers

On Tue, Sep 24, 2019 at 02:51:01PM +0300, Kirill A. Shutemov wrote:
> On Fri, Sep 20, 2019 at 12:03:21PM +0530, Anshuman Khandual wrote:
> > This series adds a test validation for architecture exported page table
> > helpers. Patch in the series adds basic transformation tests at various
> > levels of the page table. Before that it exports gigantic page allocation
> > function from HugeTLB.
> > 
> > This test was originally suggested by Catalin during arm64 THP migration
> > RFC discussion earlier. Going forward it can include more specific tests
> > with respect to various generic MM functions like THP, HugeTLB etc and
> > platform specific tests.
> > 
> > https://lore.kernel.org/linux-mm/20190628102003.GA56463@arrakis.emea.arm.com/
> > 
> > Testing:
> > 
> > Successfully build and boot tested on both arm64 and x86 platforms without
> > any test failing. Only build tested on some other platforms. Build failed
> > on some platforms (known) in pud_clear_tests() as there were no available
> > __pgd() definitions.
> > 
> > - ARM32
> > - IA64
> 
> Hm. Grep shows __pgd() definitions for both of them. Is it for specific
> config?
 
For ARM32 it's defined only for 3-lelel page tables, i.e with LPAE on.
For IA64 it's defined for !STRICT_MM_TYPECHECKS which is even not a config
option, but a define in arch/ia64/include/asm/page.h
 
> -- 
>  Kirill A. Shutemov

-- 
Sincerely yours,
Mike.