linux-kernel - Re: [PATCH v9 10/21] mm: Add generic p?d

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Message-ID: <20190729125013.GA33794@lakrids.cambridge.arm.com>
Date:   Mon, 29 Jul 2019 13:50:13 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     Steven Price <steven.price@....com>, linux-mm@...ck.org,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        James Morse <james.morse@....com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v9 10/21] mm: Add generic p?d_leaf() macros

On Sun, Jul 28, 2019 at 05:14:31PM +0530, Anshuman Khandual wrote:
> On 07/23/2019 03:11 PM, Mark Rutland wrote:
> > It might also be worth pointing out the reasons for this naming, e.g.
> > p?d_large() aren't currently generic, and this name minimizes potential
> > confusion between p?d_{large,huge}().
> 
> Agreed. But these fallback also need to first check non-availability of large
> pages. 

We're deliberately not making the p?d_large() helpers generic, so this
shouldn't fall back on those.

It's up to the architecture to implement these correctly, and the
architecture-specific implementations will be added in subsequent
patches.

Thanks,
Mark.