linux-kernel - Re: [PATCH 0/3] move __HAVE_ARCH_PTE

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Date:   Mon, 9 Apr 2018 18:17:16 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        Jerome Glisse <jglisse@...hat.com>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "aneesh.kumar@...ux.vnet.ibm.com" <aneesh.kumar@...ux.vnet.ibm.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <albert@...ive.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH 0/3] move __HAVE_ARCH_PTE_SPECIAL in Kconfig

On 09/04/2018 18:03, Vineet Gupta wrote:
> On 04/09/2018 06:57 AM, Laurent Dufour wrote:
>> The per architecture __HAVE_ARCH_PTE_SPECIAL is defined statically in the
>> per architecture header files. This doesn't allow to make other
>> configuration dependent on it.
> 
> So I understand this series has more "readability" value and I'm fine with this
> change but I wonder if you really would want to make something depend on it or
> make this de-configurable. PTE special is really a fundamental construct - e.g.
> it is used for anon mapped pages where zero page has been wired up etc...

I don't want it to be de-configurable. This is almost like
ARCH_SUPPORTS_MEMORY_FAILURE, ARCH_USES_HIGH_VMA_FLAGS, ARCH_HAS_HMM...

These values are selected by per architecture Kconfig files and are not exposed
through the configuration menu.

Concerning making something depend on it, I will probably make
CONFIG_SPECULATIVE_PAGE_FAULT introduced by the SPF series dependent on it.
For details, please see https://lkml.org/lkml/2018/3/13/1143

Thanks,
Laurent.