linux-kernel - Re: [PATCH 01/13] arm64: mm: Add p?d

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Message-ID: <eb7e0203-db08-743b-dbed-a7032b352ded@arm.com>
Date:   Mon, 18 Feb 2019 15:30:38 +0000
From:   Steven Price <steven.price@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>, x86@...nel.org,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        James Morse <james.morse@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/13] arm64: mm: Add p?d_large() definitions

On 18/02/2019 15:06, Peter Zijlstra wrote:
> On Mon, Feb 18, 2019 at 02:29:52PM +0000, Mark Rutland wrote:
>> I think that Peter means p?d_huge(x) should imply p?d_large(x), e.g.
>>
>> #define pmd_large(x) \
>> 	(pmd_sect(x) || pmd_huge(x) || pmd_trans_huge(x))
>>
>> ... which should work regardless of CONFIG_HUGETLB_PAGE.
> 
> Yep, that.

I'm not aware of a situation where pmd_huge(x) is true but pmd_sect(x)
isn't. Equally for pmd_huge(x) and pmd_trans_huge(x).

What am I missing?

Steve