linux-kernel - Re: [PATCH v3 03/34] arm: mm: Add p?d

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Message-ID: <20190301214715.hyzy5tevvwgki4w5@kshutemo-mobl1>
Date:   Sat, 2 Mar 2019 00:47:15 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Steven Price <steven.price@....com>
Cc:     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.deacon@....com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Rutland <Mark.Rutland@....com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v3 03/34] arm: mm: Add p?d_large() definitions

On Wed, Feb 27, 2019 at 05:05:37PM +0000, Steven Price wrote:
> walk_page_range() is going to be allowed to walk page tables other than
> those of user space. For this it needs to know when it has reached a
> 'leaf' entry in the page tables. This information will be provided by the
> p?d_large() functions/macros.
> 
> For arm, we already provide most p?d_large() macros. Add a stub for PUD
> as we don't have huge pages at that level.

We do not have PUD for 2- and 3-level paging. Macros from generic header
should cover it, shouldn't it?

-- 
 Kirill A. Shutemov