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

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Date:   Mon, 9 Apr 2018 09:03:49 -0700
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Laurent Dufour <ldufour@...ux.vnet.ibm.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>,
        Vineet Gupta <Vineet.Gupta1@...opsys.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 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...

-Vineet

> This series is moving the __HAVE_ARCH_PTE_SPECIAL into the Kconfig files,
> setting it automatically when architectures was already setting it in
> header file.
>
> There is no functional change introduced by this series.