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Date:   Mon, 4 Mar 2019 13:16:47 +0000
From:   Steven Price <>
To:     "Kirill A. Shutemov" <>
Cc:     Mark Rutland <>,,
        Peter Zijlstra <>,
        Catalin Marinas <>,
        Dave Hansen <>,
        Will Deacon <>,,
        "H. Peter Anvin" <>,
        "Liang, Kan" <>,,
        Ingo Molnar <>,
        Fenghua Yu <>,
        Arnd Bergmann <>,
        Jérôme Glisse <>,
        Borislav Petkov <>,
        Andy Lutomirski <>,
        Thomas Gleixner <>,,
        Tony Luck <>,
        Ard Biesheuvel <>,, James Morse <>
Subject: Re: [PATCH v3 08/34] ia64: mm: Add p?d_large() definitions

On 01/03/2019 21:57, Kirill A. Shutemov wrote:
> On Wed, Feb 27, 2019 at 05:05:42PM +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 is provided by the
>> p?d_large() functions/macros.
>> For ia64 leaf entries are always at the lowest level, so implement
>> stubs returning 0.
> Are you sure about this? I see pte_mkhuge defined for ia64 and Kconfig
> contains hugetlb references.

I'm not completely familiar with ia64, but my understanding is that it
doesn't have the situation where a page table walk ends early - there is
always the full depth of entries. The p?d_huge() functions always return 0.

However my understanding is that it does support huge TLB entries, so
when populating the TLB a region larger than a standard page can be mapped.

I'd definitely welcome review by someone more familiar with ia64 to
check my assumptions.



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